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    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableCurrent_55A004C701EDCF7EE8087A7E019D9B64_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableCurrent_55A004C701EDCF7EE8087A7E019D9B64" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2013</link:label>
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    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsReceivable_FD3334BB36534DDDAF0D7A7E019DA7AE_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsReceivable_FD3334BB36534DDDAF0D7A7E019DA7AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Receivable</link:label>
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    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_B8253D8045392856911E7A7E0170D298_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_B8253D8045392856911E7A7E0170D298" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Liabilities, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_B8253D8045392856911E7A7E0170D298" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CustomerAdvancesCurrent_632E9A13C2DEC68B6FB57A7E0170B1CB_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_632E9A13C2DEC68B6FB57A7E0170B1CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Advance payments from customers</link:label>
    <link:label id="lab_us-gaap_CustomerAdvancesCurrent_632E9A13C2DEC68B6FB57A7E0170B1CB_label_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_632E9A13C2DEC68B6FB57A7E0170B1CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Advances, Current</link:label>
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    <link:label id="lab_omcl_AccruedGroupPurchasingOrgFees_FB6ABDEFC801F10533AB7A7E01707D70_label_en-US" xlink:label="lab_omcl_AccruedGroupPurchasingOrgFees_FB6ABDEFC801F10533AB7A7E01707D70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued group purchasing org fees</link:label>
    <link:label id="lab_omcl_AccruedGroupPurchasingOrgFees_FB6ABDEFC801F10533AB7A7E01707D70_documentation_en-US" xlink:label="lab_omcl_AccruedGroupPurchasingOrgFees_FB6ABDEFC801F10533AB7A7E01707D70" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accrued group purchasing org fees - Fees payable to GPOs (broup purchasing org's for hospitals) for aggregating customer orders</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_AccruedGroupPurchasingOrgFees" xlink:label="loc_omcl_AccruedGroupPurchasingOrgFees_FB6ABDEFC801F10533AB7A7E01707D70" xlink:type="locator" />
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    <link:label id="lab_omcl_Technologylicensepurchaseobigationcurrent_5A0FF55A1E55020B2F077A7E01708CDD_terseLabel_en-US" xlink:label="lab_omcl_Technologylicensepurchaseobigationcurrent_5A0FF55A1E55020B2F077A7E01708CDD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">technologylicensepurchaseobigationcurrent</link:label>
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    <link:label id="lab_omcl_Technologylicensepurchaseobigationcurrent_5A0FF55A1E55020B2F077A7E01708CDD_documentation_en-US" xlink:label="lab_omcl_Technologylicensepurchaseobigationcurrent_5A0FF55A1E55020B2F077A7E01708CDD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">technology license purchaseobigation current portion</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_Technologylicensepurchaseobigationcurrent" xlink:label="loc_omcl_Technologylicensepurchaseobigationcurrent_5A0FF55A1E55020B2F077A7E01708CDD" xlink:type="locator" />
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    <link:label id="lab_omcl_RebatesAndLeaseBuyouts_4DAB6CB5642666D0B78B7A7E0170A3D2_terseLabel_en-US" xlink:label="lab_omcl_RebatesAndLeaseBuyouts_4DAB6CB5642666D0B78B7A7E0170A3D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rebates and lease buyouts</link:label>
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    <link:label id="lab_omcl_RebatesAndLeaseBuyouts_4DAB6CB5642666D0B78B7A7E0170A3D2_documentation_en-US" xlink:label="lab_omcl_RebatesAndLeaseBuyouts_4DAB6CB5642666D0B78B7A7E0170A3D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rebates and Lease buyouts - current liability owed to customers due to unredeemed rebates on purchases or the amount owed to a leasing customer to buy out their lease before maturity</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_RebatesAndLeaseBuyouts" xlink:label="loc_omcl_RebatesAndLeaseBuyouts_4DAB6CB5642666D0B78B7A7E0170A3D2" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7E35143B7D76901EB30D7A7E0114090D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7E35143B7D76901EB30D7A7E0114090D" xlink:to="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7E35143B7D76901EB30D7A7E0114090D" xlink:type="arc" />
    <link:label id="lab_omcl_StockOptionPlansPsusAbstract_89053AF06DEB6AF432372F49F1935C0A_label_en-US" xlink:label="lab_omcl_StockOptionPlansPsusAbstract_89053AF06DEB6AF432372F49F1935C0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Option Plans - PSUs [Abstract]</link:label>
    <link:label id="lab_omcl_StockOptionPlansPsusAbstract_89053AF06DEB6AF432372F49F1935C0A_documentation_en-US" xlink:label="lab_omcl_StockOptionPlansPsusAbstract_89053AF06DEB6AF432372F49F1935C0A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Stock Option Plans - PSUs [Abstract]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_StockOptionPlansPsusAbstract" xlink:label="loc_omcl_StockOptionPlansPsusAbstract_89053AF06DEB6AF432372F49F1935C0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_StockOptionPlansPsusAbstract_89053AF06DEB6AF432372F49F1935C0A" xlink:to="lab_omcl_StockOptionPlansPsusAbstract_89053AF06DEB6AF432372F49F1935C0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_MinimumMember_7F10B95E15719FA3A5D32F49F193D2D2_terseLabel_en-US" xlink:label="lab_us-gaap_MinimumMember_7F10B95E15719FA3A5D32F49F193D2D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:label id="lab_us-gaap_MinimumMember_7F10B95E15719FA3A5D32F49F193D2D2_label_en-US" xlink:label="lab_us-gaap_MinimumMember_7F10B95E15719FA3A5D32F49F193D2D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_7F10B95E15719FA3A5D32F49F193D2D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinimumMember_7F10B95E15719FA3A5D32F49F193D2D2" xlink:to="lab_us-gaap_MinimumMember_7F10B95E15719FA3A5D32F49F193D2D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_MaximumMember_62795203B3EC3C4AC2152F49F19354D6_terseLabel_en-US" xlink:label="lab_us-gaap_MaximumMember_62795203B3EC3C4AC2152F49F19354D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:label id="lab_us-gaap_MaximumMember_62795203B3EC3C4AC2152F49F19354D6_label_en-US" xlink:label="lab_us-gaap_MaximumMember_62795203B3EC3C4AC2152F49F19354D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_62795203B3EC3C4AC2152F49F19354D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MaximumMember_62795203B3EC3C4AC2152F49F19354D6" xlink:to="lab_us-gaap_MaximumMember_62795203B3EC3C4AC2152F49F19354D6" xlink:type="arc" />
    <link:label id="lab_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617_terseLabel_en-US" xlink:label="lab_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentile placement of shareholder return [Axis]</link:label>
    <link:label id="lab_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617_label_en-US" xlink:label="lab_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentile placement of shareholder return [Axis]</link:label>
    <link:label id="lab_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617_documentation_en-US" xlink:label="lab_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentile placement of shareholder return [Axis]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PercentilePlacementOfShareholderReturnAxis" xlink:label="loc_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617" xlink:to="lab_omcl_PercentilePlacementOfShareholderReturnAxis_7490768456AFC64E98C72F49F1939617" xlink:type="arc" />
    <link:label id="lab_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842_terseLabel_en-US" xlink:label="lab_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU percentile placement of retrun [Domain]</link:label>
    <link:label id="lab_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842_label_en-US" xlink:label="lab_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSU percentile placement of retrun [Domain]</link:label>
    <link:label id="lab_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842_documentation_en-US" xlink:label="lab_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU percentile placement of retrun [Domain] = the collection of all possible PSU percentile placements for shareholder return</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PsuPercentilePlacementOfRetrunDomain" xlink:label="loc_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842" xlink:to="lab_omcl_PsuPercentilePlacementOfRetrunDomain_4B95F1FC0259DAA4294E2F49F193B842" xlink:type="arc" />
    <link:label id="lab_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD_terseLabel_en-US" xlink:label="lab_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Below the 75th percentile ranking [Member]</link:label>
    <link:label id="lab_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD_label_en-US" xlink:label="lab_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Below the 75th percentile ranking [Member]</link:label>
    <link:label id="lab_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD_documentation_en-US" xlink:label="lab_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Below the 75th percentile ranking [Member] - = More than 65th percentile, but below the 75th percentile, subject to linear interpolation, first program year only</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_Below75ThPercentileRankingMember" xlink:label="loc_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD" xlink:to="lab_omcl_Below75ThPercentileRankingMember_6E840A1B07EFC332B9322F49F193DCFD" xlink:type="arc" />
    <link:label id="lab_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50_terseLabel_en-US" xlink:label="lab_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Below the 35th percentile ranking [Member]</link:label>
    <link:label id="lab_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50_label_en-US" xlink:label="lab_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Below the 35th percentile ranking [Member]</link:label>
    <link:label id="lab_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50_documentation_en-US" xlink:label="lab_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU percentile placement of return [Domain] Below the 35th percentile [Member] - resutling vesting if ranking is below the 35th percentile</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_Below35ThPercentileRankingMember" xlink:label="loc_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50" xlink:to="lab_omcl_Below35ThPercentileRankingMember_323D894BD923415B88042F49F193CC50" xlink:type="arc" />
    <link:label id="lab_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE_terseLabel_en-US" xlink:label="lab_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">At least 50th percentile (after yr one) [Member]</link:label>
    <link:label id="lab_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE_label_en-US" xlink:label="lab_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">At least 50th percentile (after yr one) [Member]</link:label>
    <link:label id="lab_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE_documentation_en-US" xlink:label="lab_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">At least 50th percentile (after yr one) [Member] = for program years after year one, refers to PSU vesting result for any ranking in the 50th percentile or higher</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_AtLeast50ThPercentileAfterYrOneMember" xlink:label="loc_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE" xlink:to="lab_omcl_AtLeast50ThPercentileAfterYrOneMember_B5FE0C5F76F0314E90152F49F19365BE" xlink:type="arc" />
    <link:label id="lab_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B_terseLabel_en-US" xlink:label="lab_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Below 50th percentile ranking [Member]</link:label>
    <link:label id="lab_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B_label_en-US" xlink:label="lab_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Below 50th percentile ranking [Member]</link:label>
    <link:label id="lab_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B_documentation_en-US" xlink:label="lab_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Below 50th percentile ranking [Member] = Ranking of at least 35th percentile, but below the 50th percentile, for purposes of further PSU vesting</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_Below50ThPercentileRankingMember" xlink:label="loc_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B" xlink:to="lab_omcl_Below50ThPercentileRankingMember_1283AD02619F900141A52F49F193BE2B" xlink:type="arc" />
    <link:label id="lab_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F_terseLabel_en-US" xlink:label="lab_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2013 PSU [Member]</link:label>
    <link:label id="lab_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F_label_en-US" xlink:label="lab_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2013 PSU [Member]</link:label>
    <link:label id="lab_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F_documentation_en-US" xlink:label="lab_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2013 PSU [Member]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_A2013PsuMember" xlink:label="loc_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F" xlink:to="lab_omcl_A2013PsuMember_E2028253341C97F3111C2F49F193316F" xlink:type="arc" />
    <link:label id="lab_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8_terseLabel_en-US" xlink:label="lab_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2012 PSU [Member]</link:label>
    <link:label id="lab_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8_label_en-US" xlink:label="lab_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2012 PSU [Member]</link:label>
    <link:label id="lab_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8_documentation_en-US" xlink:label="lab_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2012 PSU [Member]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_A2012PsuMember" xlink:label="loc_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8" xlink:to="lab_omcl_A2012PsuMember_34F55BA4D6219740F80C2F49F1938BF8" xlink:type="arc" />
    <link:label id="lab_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304_terseLabel_en-US" xlink:label="lab_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU program year [Axis]</link:label>
    <link:label id="lab_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304_label_en-US" xlink:label="lab_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSU program year [Axis]</link:label>
    <link:label id="lab_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304_documentation_en-US" xlink:label="lab_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU program year [Axis] = the numerical year of the PSU program for our entity starting with 2011 = 1</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PsuProgramYearAxis" xlink:label="loc_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304" xlink:to="lab_omcl_PsuProgramYearAxis_975BF37A26ED29574ACD2F49F193C304" xlink:type="arc" />
    <link:label id="lab_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D_terseLabel_en-US" xlink:label="lab_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU program year domain [Domain]</link:label>
    <link:label id="lab_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D_label_en-US" xlink:label="lab_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSU program year domain [Domain]</link:label>
    <link:label id="lab_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D_documentation_en-US" xlink:label="lab_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU program year domain [Domain] = the colelction of all program years</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PsuProgramYearDomainDomain" xlink:label="loc_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D" xlink:to="lab_omcl_PsuProgramYearDomainDomain_C0FC2D1791BB577CC49A2F49F193D09D" xlink:type="arc" />
    <link:label id="lab_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292_terseLabel_en-US" xlink:label="lab_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU program year one [Member]</link:label>
    <link:label id="lab_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292_label_en-US" xlink:label="lab_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSU program year one [Member]</link:label>
    <link:label id="lab_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292_documentation_en-US" xlink:label="lab_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU program year one [Member] = refers to 2011 program year, first year of PSUs for our entity</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PsuProgramYearOneMember" xlink:label="loc_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292" xlink:to="lab_omcl_PsuProgramYearOneMember_C1FDB3FB45518E8DDFB72F49F1939292" xlink:type="arc" />
    <link:label id="lab_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE_terseLabel_en-US" xlink:label="lab_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU Program Year Two [Member]</link:label>
    <link:label id="lab_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE_label_en-US" xlink:label="lab_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSU Program Year Two [Member]</link:label>
    <link:label id="lab_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE_documentation_en-US" xlink:label="lab_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU Program Year Two [Member] = second year of PSU program which for our entity is 2012</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PsuProgramYearTwoMember" xlink:label="loc_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE" xlink:to="lab_omcl_PsuProgramYearTwoMember_372948B0FBB7F86295172F49F1938AAE" xlink:type="arc" />
    <link:label id="lab_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E_terseLabel_en-US" xlink:label="lab_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU percentage eligible for time-based vesting</link:label>
    <link:label id="lab_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E_label_en-US" xlink:label="lab_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSU percentage eligible for time-based vesting</link:label>
    <link:label id="lab_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E_documentation_en-US" xlink:label="lab_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU percentage eligible for time-based vesting = the percentage of the original PSU award which will continue with service-based vesting based on the percentile ranking against total stock performance in the reference year for the health care index.</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PsuPercentageEligibleForTimeBasedVesting" xlink:label="loc_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E" xlink:to="lab_omcl_PsuPercentageEligibleForTimeBasedVesting_8BD0D140A3BF7153D08F2F49F193924E" xlink:type="arc" />
    <link:label id="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84_terseLabel_en-US" xlink:label="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement By Share-based Payment Award, Number Of Shares Eligible For Vesting</link:label>
    <link:label id="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84_label_en-US" xlink:label="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement By Share-based Payment Award, Number Of Shares Eligible For Vesting</link:label>
    <link:label id="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84_documentation_en-US" xlink:label="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement By Share-based Payment Award, Number Of Shares Eligible For Vesting</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting" xlink:label="loc_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84" xlink:to="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesEligibleForVesting_1A7F1D9DD4C217B05BE02F49F19D3F84" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_302FDD26CA63280567E62F49F19D9F02_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_302FDD26CA63280567E62F49F19D9F02" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_302FDD26CA63280567E62F49F19D9F02" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_302FDD26CA63280567E62F49F19D9F02" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_302FDD26CA63280567E62F49F19D9F02" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_61DC5CA17E9EFB74EDD52F49F19D80B7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_61DC5CA17E9EFB74EDD52F49F19D80B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_61DC5CA17E9EFB74EDD52F49F19D80B7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_61DC5CA17E9EFB74EDD52F49F19D80B7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_61DC5CA17E9EFB74EDD52F49F19D80B7" xlink:type="arc" />
    <link:label id="lab_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389_terseLabel_en-US" xlink:label="lab_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentile ranking of 2011 shareholder return</link:label>
    <link:label id="lab_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389_label_en-US" xlink:label="lab_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentile ranking of 2011 shareholder return</link:label>
    <link:label id="lab_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389_documentation_en-US" xlink:label="lab_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentile ranking of 2011 shareholder return = the actual percentile ranking for our entity among the health care stock index companies for calendar 2011 total shareholder return</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PercentileRankingOf2011ShareholderReturn" xlink:label="loc_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389" xlink:to="lab_omcl_PercentileRankingOf2011ShareholderReturn_E8CD0E9CF32DDDDFB1372F49F19D1389" xlink:type="arc" />
    <link:label id="lab_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8_terseLabel_en-US" xlink:label="lab_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU percentage eligible for vesting based on actual return</link:label>
    <link:label id="lab_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8_label_en-US" xlink:label="lab_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSU percentage eligible for vesting based on actual return</link:label>
    <link:label id="lab_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8_documentation_en-US" xlink:label="lab_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PSU percentage eligible for vesting based on actual return = percentage of original PSU awards that continue under service-based vesting, based on percentile performance in the grant year for Total Shareholder Return</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PsuPercentageEligibleForVestingBasedOnActualReturn" xlink:label="loc_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8" xlink:to="lab_omcl_PsuPercentageEligibleForVestingBasedOnActualReturn_4E28A69A2955F44C6C132F49F19D55E8" xlink:type="arc" />
    <link:label id="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C_terseLabel_en-US" xlink:label="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based payment Award, Percent Vested in First Year</link:label>
    <link:label id="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C_label_en-US" xlink:label="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based payment Award, Percent Vested in First Year</link:label>
    <link:label id="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C_documentation_en-US" xlink:label="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based payment Award, Percent Vested in First Year = Cliff vesting after 12 months for the first year of service under the award</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear" xlink:label="loc_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C" xlink:to="lab_omcl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentVestedInFirstYear_C2A23CCB51AF2C2B59762F49F19DFE3C" xlink:type="arc" />
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_97F7C346C8300BDA4C547A7E01330CB3_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_97F7C346C8300BDA4C547A7E01330CB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
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    <link:label id="lab_us-gaap_TradingSecurities_F0D00A104375F70CA5947A7E01334249_terseLabel_en-US" xlink:label="lab_us-gaap_TradingSecurities_F0D00A104375F70CA5947A7E01334249" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading Securities</link:label>
    <link:label id="lab_us-gaap_TradingSecurities_F0D00A104375F70CA5947A7E01334249_label_en-US" xlink:label="lab_us-gaap_TradingSecurities_F0D00A104375F70CA5947A7E01334249" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Securities</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_2B1C3D3DC3CBD140FD1F7A7E0134A901_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_2B1C3D3DC3CBD140FD1F7A7E0134A901" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_2B1C3D3DC3CBD140FD1F7A7E0134A901" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_2B1C3D3DC3CBD140FD1F7A7E0134A901" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_2B1C3D3DC3CBD140FD1F7A7E0134A901" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesFairValue_E3985746B24723544CC97A7E01341EFC_terseLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesFairValue_E3985746B24723544CC97A7E01341EFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Fair Value</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_AcuteCareSolutionsMember_D59CBAA9A1816A6746B77A7E01FC62D1" xlink:to="lab_omcl_AcuteCareSolutionsMember_D59CBAA9A1816A6746B77A7E01FC62D1" xlink:type="arc" />
    <link:label id="lab_omcl_NonAcuteCareSolutionsMember_824E3AA1DCFD05C3E3F67A7E01FC8760_terseLabel_en-US" xlink:label="lab_omcl_NonAcuteCareSolutionsMember_824E3AA1DCFD05C3E3F67A7E01FC8760" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-acute care solutions [Member]</link:label>
    <link:label id="lab_omcl_NonAcuteCareSolutionsMember_824E3AA1DCFD05C3E3F67A7E01FC8760_label_en-US" xlink:label="lab_omcl_NonAcuteCareSolutionsMember_824E3AA1DCFD05C3E3F67A7E01FC8760" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-acute care solutions [Member]</link:label>
    <link:label id="lab_omcl_NonAcuteCareSolutionsMember_824E3AA1DCFD05C3E3F67A7E01FC8760_documentation_en-US" xlink:label="lab_omcl_NonAcuteCareSolutionsMember_824E3AA1DCFD05C3E3F67A7E01FC8760" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Non-acute care solutions [Member] is the business foe medicine adherence technology used in pharmacies and institutional settings wtih long-term care</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_NonAcuteCareSolutionsMember" xlink:label="loc_omcl_NonAcuteCareSolutionsMember_824E3AA1DCFD05C3E3F67A7E01FC8760" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_C460ED795AD9780F6AA37A7E01FC7749_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_C460ED795AD9780F6AA37A7E01FC7749" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_C460ED795AD9780F6AA37A7E01FC7749_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_C460ED795AD9780F6AA37A7E01FC7749" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, Depletion and Amortization</link:label>
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    <link:label id="lab_us-gaap_SegmentReportingInformationNetAssets_4C01BD94C4D34E7CD7FE7A7E01FC312A_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationNetAssets_4C01BD94C4D34E7CD7FE7A7E01FC312A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment Reporting Information, Net Assets</link:label>
    <link:label id="lab_us-gaap_SegmentReportingInformationNetAssets_4C01BD94C4D34E7CD7FE7A7E01FC312A_label_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationNetAssets_4C01BD94C4D34E7CD7FE7A7E01FC312A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting Information, Net Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingInformationNetAssets" xlink:label="loc_us-gaap_SegmentReportingInformationNetAssets_4C01BD94C4D34E7CD7FE7A7E01FC312A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingInformationNetAssets_4C01BD94C4D34E7CD7FE7A7E01FC312A" xlink:to="lab_us-gaap_SegmentReportingInformationNetAssets_4C01BD94C4D34E7CD7FE7A7E01FC312A" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfRevenue_8B9C9E96CEE99578825B7A7E01FD5F25_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfRevenue_8B9C9E96CEE99578825B7A7E01FD5F25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of Revenue</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_8B9C9E96CEE99578825B7A7E01FD5F25" xlink:type="locator" />
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    <link:label id="lab_omcl_GrossMarginPercentage_626C32B1FF1D2D11DCCE7A7E01FD9238_terseLabel_en-US" xlink:label="lab_omcl_GrossMarginPercentage_626C32B1FF1D2D11DCCE7A7E01FD9238" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross Margin Percentage</link:label>
    <link:label id="lab_omcl_GrossMarginPercentage_626C32B1FF1D2D11DCCE7A7E01FD9238_label_en-US" xlink:label="lab_omcl_GrossMarginPercentage_626C32B1FF1D2D11DCCE7A7E01FD9238" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross Margin Percentage</link:label>
    <link:label id="lab_omcl_GrossMarginPercentage_626C32B1FF1D2D11DCCE7A7E01FD9238_documentation_en-US" xlink:label="lab_omcl_GrossMarginPercentage_626C32B1FF1D2D11DCCE7A7E01FD9238" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gross Margin Percentage is the gross margin dollars divided by Sales</link:label>
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    <link:label id="lab_us-gaap_OperatingExpenses_9FBA94CBFC97604D588B7A7E01FD0ABC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses_9FBA94CBFC97604D588B7A7E01FD0ABC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_9FBA94CBFC97604D588B7A7E01FD0ABC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpenses_9FBA94CBFC97604D588B7A7E01FD0ABC" xlink:to="lab_us-gaap_OperatingExpenses_9FBA94CBFC97604D588B7A7E01FD0ABC" xlink:type="arc" />
    <link:label id="lab_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045_terseLabel_en-US" xlink:label="lab_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating margin percentage</link:label>
    <link:label id="lab_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045_label_en-US" xlink:label="lab_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating margin percentage</link:label>
    <link:label id="lab_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045_documentation_en-US" xlink:label="lab_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Operating margin percentage is the operating income divided by revenues</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_OperatingMarginPercentage" xlink:label="loc_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045" xlink:to="lab_omcl_OperatingMarginPercentage_6E2181A95D0566A5D6707A7E01FD0045" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdditionsToNoncurrentAssets_886292307EAEA2F7A8E67A7E01FDF6D2_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionsToNoncurrentAssets_886292307EAEA2F7A8E67A7E01FDF6D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment Reporting Information, Expenditures for Additions to Long-Lived Assets</link:label>
    <link:label id="lab_us-gaap_AdditionsToNoncurrentAssets_886292307EAEA2F7A8E67A7E01FDF6D2_label_en-US" xlink:label="lab_us-gaap_AdditionsToNoncurrentAssets_886292307EAEA2F7A8E67A7E01FDF6D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting Information, Expenditures for Additions to Long-Lived Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdditionsToNoncurrentAssets" xlink:label="loc_us-gaap_AdditionsToNoncurrentAssets_886292307EAEA2F7A8E67A7E01FDF6D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionsToNoncurrentAssets_886292307EAEA2F7A8E67A7E01FDF6D2" xlink:to="lab_us-gaap_AdditionsToNoncurrentAssets_886292307EAEA2F7A8E67A7E01FDF6D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_94B20F825AF2E90E0ACC7A7E01202B55_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_94B20F825AF2E90E0ACC7A7E01202B55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_94B20F825AF2E90E0ACC7A7E01202B55" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_94B20F825AF2E90E0ACC7A7E01202B55" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentAbstract_94B20F825AF2E90E0ACC7A7E01202B55" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_FFEF4B071FB6F9A73F577A7E0120D9D3_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_FFEF4B071FB6F9A73F577A7E0120D9D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_FFEF4B071FB6F9A73F577A7E0120D9D3_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_FFEF4B071FB6F9A73F577A7E0120D9D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_FFEF4B071FB6F9A73F577A7E0120D9D3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_FFEF4B071FB6F9A73F577A7E0120D9D3" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_FFEF4B071FB6F9A73F577A7E0120D9D3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_41D3D3FAFB20110D2FC37A7E0172AE11_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_41D3D3FAFB20110D2FC37A7E0172AE11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_41D3D3FAFB20110D2FC37A7E0172AE11_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_41D3D3FAFB20110D2FC37A7E0172AE11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_41D3D3FAFB20110D2FC37A7E0172AE11" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_41D3D3FAFB20110D2FC37A7E0172AE11" xlink:to="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_41D3D3FAFB20110D2FC37A7E0172AE11" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_53E556AFD62AEF63801C7A7E01D92081_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_53E556AFD62AEF63801C7A7E01D92081" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Option Plans and Share-Based Compensation</link:label>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_53E556AFD62AEF63801C7A7E01D92081_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_53E556AFD62AEF63801C7A7E01D92081" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Compensation Related Costs, Share-based Payments [Text Block]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_53E556AFD62AEF63801C7A7E01D92081" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_53E556AFD62AEF63801C7A7E01D92081" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_52E5002743D94C9974F9245DC5BCD6B9_label_en-US" xlink:label="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_52E5002743D94C9974F9245DC5BCD6B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Other Comprehensive Income [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_52E5002743D94C9974F9245DC5BCD6B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_52E5002743D94C9974F9245DC5BCD6B9" xlink:to="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_52E5002743D94C9974F9245DC5BCD6B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_108E2B4518AC8B4B0585245DC5BCFA2F_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_108E2B4518AC8B4B0585245DC5BCFA2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income, net of tax:</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_108E2B4518AC8B4B0585245DC5BCFA2F_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_108E2B4518AC8B4B0585245DC5BCFA2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_108E2B4518AC8B4B0585245DC5BCFA2F" xlink:type="locator" />
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    <link:label id="lab_omcl_PurchasesFromSignificantSupplier_4CBFB5D2AE4A2B48BFD87A7E01866EF3_terseLabel_en-US" xlink:label="lab_omcl_PurchasesFromSignificantSupplier_4CBFB5D2AE4A2B48BFD87A7E01866EF3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchases from significant supplier</link:label>
    <link:label id="lab_omcl_PurchasesFromSignificantSupplier_4CBFB5D2AE4A2B48BFD87A7E01866EF3_label_en-US" xlink:label="lab_omcl_PurchasesFromSignificantSupplier_4CBFB5D2AE4A2B48BFD87A7E01866EF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchases from significant supplier</link:label>
    <link:label id="lab_omcl_PurchasesFromSignificantSupplier_4CBFB5D2AE4A2B48BFD87A7E01866EF3_documentation_en-US" xlink:label="lab_omcl_PurchasesFromSignificantSupplier_4CBFB5D2AE4A2B48BFD87A7E01866EF3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchases from significant supplier - pruchasses during period from most significant supplier mentioned in Supplier Dependence section of Note 1</link:label>
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    <link:label id="lab_omcl_ProductSalesDeliveredAndInvoicedNotInstalled_28BFE0318BFBC6304CD07A7E0155CC8E_terseLabel_en-US" xlink:label="lab_omcl_ProductSalesDeliveredAndInvoicedNotInstalled_28BFE0318BFBC6304CD07A7E0155CC8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sales of Medication and supply dispensing systems and packaging equipment, which have been delivered and invoiced but not yet installed</link:label>
    <link:label id="lab_omcl_ProductSalesDeliveredAndInvoicedNotInstalled_28BFE0318BFBC6304CD07A7E0155CC8E_label_en-US" xlink:label="lab_omcl_ProductSalesDeliveredAndInvoicedNotInstalled_28BFE0318BFBC6304CD07A7E0155CC8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product sales, delivered and invoiced not installed</link:label>
    <link:label id="lab_omcl_ProductSalesDeliveredAndInvoicedNotInstalled_28BFE0318BFBC6304CD07A7E0155CC8E_documentation_en-US" xlink:label="lab_omcl_ProductSalesDeliveredAndInvoicedNotInstalled_28BFE0318BFBC6304CD07A7E0155CC8E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Product sales, delivered and invoiced not installed - Deferred revenue value (before subtracting COS) for medical dispensing and supply systems that are delivered and invoiced but not yet installed.</link:label>
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    <link:label id="lab_omcl_CostOfSalesExcludingInstallationCostsForDeferredGrossProfit_70F00A32E8E74FEAC27A7A7E01552CA1_negatedTerseLabel_en-US" xlink:label="lab_omcl_CostOfSalesExcludingInstallationCostsForDeferredGrossProfit_70F00A32E8E74FEAC27A7A7E01552CA1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Cost of revenues, excluding installation costs</link:label>
    <link:label id="lab_omcl_CostOfSalesExcludingInstallationCostsForDeferredGrossProfit_70F00A32E8E74FEAC27A7A7E01552CA1_label_en-US" xlink:label="lab_omcl_CostOfSalesExcludingInstallationCostsForDeferredGrossProfit_70F00A32E8E74FEAC27A7A7E01552CA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">cost of sales, excluding installation costs for deferred gross profit</link:label>
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    <link:label id="lab_omcl_DeferredGrossProfit_5D8E70647B71DE7883F57A7E01556C50_totalLabel_en-US" xlink:label="lab_omcl_DeferredGrossProfit_5D8E70647B71DE7883F57A7E01556C50" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Deferred gross profit</link:label>
    <link:label id="lab_omcl_DeferredGrossProfit_5D8E70647B71DE7883F57A7E01556C50_label_en-US" xlink:label="lab_omcl_DeferredGrossProfit_5D8E70647B71DE7883F57A7E01556C50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Gross Profit</link:label>
    <link:label id="lab_omcl_DeferredGrossProfit_5D8E70647B71DE7883F57A7E01556C50_documentation_en-US" xlink:label="lab_omcl_DeferredGrossProfit_5D8E70647B71DE7883F57A7E01556C50" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The gross profit not recognized in income that consists of sales of tangible products, which have been delivered and invoiced but not yet installed less the costs of revenues, excluding the installation costs.</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_DeferredGrossProfit" xlink:label="loc_omcl_DeferredGrossProfit_5D8E70647B71DE7883F57A7E01556C50" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetImpairmentCharges_CDCAAC353A1E493704FF7A7E01C56B31_label_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_CDCAAC353A1E493704FF7A7E01C56B31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Impairment Charges</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_CDCAAC353A1E493704FF7A7E01C56B31" xlink:type="locator" />
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    <link:label id="lab_omcl_ChangeInAccountingEstimateImpactOnDiltedEps_D551681B5F89F5289D457A7E01C58B98_terseLabel_en-US" xlink:label="lab_omcl_ChangeInAccountingEstimateImpactOnDiltedEps_D551681B5F89F5289D457A7E01C58B98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in accounting estimate impact on dilted eps</link:label>
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    <link:label id="lab_omcl_ChangeInAccountingEstimateImpactOnDiltedEps_D551681B5F89F5289D457A7E01C58B98_documentation_en-US" xlink:label="lab_omcl_ChangeInAccountingEstimateImpactOnDiltedEps_D551681B5F89F5289D457A7E01C58B98" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Change in accounting estimate impact on dilted eps</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_ChangeInAccountingEstimateImpactOnDiltedEps" xlink:label="loc_omcl_ChangeInAccountingEstimateImpactOnDiltedEps_D551681B5F89F5289D457A7E01C58B98" xlink:type="locator" />
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    <link:label id="lab_omcl_DeferredGrossProfitTextBlock_81979B12CB53B983211B7A7E0147ABE4_terseLabel_en-US" xlink:label="lab_omcl_DeferredGrossProfitTextBlock_81979B12CB53B983211B7A7E0147ABE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred Gross Profit [Text Block]</link:label>
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    <link:label id="lab_omcl_DeferredGrossProfitTextBlock_81979B12CB53B983211B7A7E0147ABE4_documentation_en-US" xlink:label="lab_omcl_DeferredGrossProfitTextBlock_81979B12CB53B983211B7A7E0147ABE4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The gross profit not recognized in income that consists of sales of tangible products, which have been delivered and invoiced but not yet installed less the costs of revenues, excluding the installation costs.</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_DeferredGrossProfitTextBlock" xlink:label="loc_omcl_DeferredGrossProfitTextBlock_81979B12CB53B983211B7A7E0147ABE4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock_DDDAF45EE169106AABD17A7E01575CC4_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock_DDDAF45EE169106AABD17A7E01575CC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock_DDDAF45EE169106AABD17A7E01575CC4_label_en-US" xlink:label="lab_us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock_DDDAF45EE169106AABD17A7E01575CC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_5D675DDE51634FADC7F37A7E015785A3_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_5D675DDE51634FADC7F37A7E015785A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_A6009435F1BC5290D4C37A7E020E6109_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_A6009435F1BC5290D4C37A7E020E6109" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Operating Leased Assets [Table]</link:label>
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    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_1773AFC2B3695F0B79837A7E020E2ACF_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_1773AFC2B3695F0B79837A7E020E2ACF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Axis]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_1773AFC2B3695F0B79837A7E020E2ACF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_3BA0B312F783017887D07A7E020E1E5C_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_3BA0B312F783017887D07A7E020E1E5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Domain]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_3BA0B312F783017887D07A7E020E1E5C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_3BA0B312F783017887D07A7E020E1E5C" xlink:to="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_3BA0B312F783017887D07A7E020E1E5C" xlink:type="arc" />
    <link:label id="lab_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073_terseLabel_en-US" xlink:label="lab_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease- Mountain View, CA 590 Middlefield road [Member]</link:label>
    <link:label id="lab_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073_label_en-US" xlink:label="lab_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease- Mountain View, CA 590 Middlefield road [Member]</link:label>
    <link:label id="lab_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073_documentation_en-US" xlink:label="lab_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lease- Mountain View, CA 590 Middlefield road [Member]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_LeaseMountainViewCa590MiddlefieldRoadMember" xlink:label="loc_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073" xlink:to="lab_omcl_LeaseMountainViewCa590MiddlefieldRoadMember_093B81D4CEB31F46163C7A7E020EF073" xlink:type="arc" />
    <link:label id="lab_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367_terseLabel_en-US" xlink:label="lab_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease - Milpitas, CA 735 Sycamore Drive [Member]</link:label>
    <link:label id="lab_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367_label_en-US" xlink:label="lab_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease - Milpitas, CA 735 Sycamore Drive [Member]</link:label>
    <link:label id="lab_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367_documentation_en-US" xlink:label="lab_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lease - Milpitas, CA 735 Sycamore Drive [Member]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_LeaseMilpitasCa735SycamoreDriveMember" xlink:label="loc_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367" xlink:to="lab_omcl_LeaseMilpitasCa735SycamoreDriveMember_2BE0B4B328A715D675DE7A7E020E5367" xlink:type="arc" />
    <link:label id="lab_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828_terseLabel_en-US" xlink:label="lab_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member]</link:label>
    <link:label id="lab_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828_label_en-US" xlink:label="lab_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member]</link:label>
    <link:label id="lab_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828_documentation_en-US" xlink:label="lab_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember" xlink:label="loc_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828" xlink:to="lab_omcl_LeaseStPetersburgFl2003GaudyBldvdNorthMember_3676549F6B32A25993AA7A7E020E8828" xlink:type="arc" />
    <link:label id="lab_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6_terseLabel_en-US" xlink:label="lab_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">lease - Leeds, United Kingdom [Member]</link:label>
    <link:label id="lab_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6_label_en-US" xlink:label="lab_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">lease - Leeds, United Kingdom [Member]</link:label>
    <link:label id="lab_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6_documentation_en-US" xlink:label="lab_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">lease - Leeds, United Kingdom [Member]</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_LeaseLeedsUnitedKingdomMember" xlink:label="loc_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6" xlink:to="lab_omcl_LeaseLeedsUnitedKingdomMember_D3A9E4B000D0CD7598A47A7E020EB0B6" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_9EA879B16A56AD61D7A57A7E020EBF04_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_9EA879B16A56AD61D7A57A7E020EBF04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leased Assets [Line Items]</link:label>
    <link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_9EA879B16A56AD61D7A57A7E020EBF04_label_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_9EA879B16A56AD61D7A57A7E020EBF04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leased Assets [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_9EA879B16A56AD61D7A57A7E020EBF04" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_9EA879B16A56AD61D7A57A7E020EBF04" xlink:to="lab_us-gaap_OperatingLeasedAssetsLineItems_9EA879B16A56AD61D7A57A7E020EBF04" xlink:type="arc" />
    <link:label id="lab_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39_terseLabel_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">property subject to operating lease, net rentable area</link:label>
    <link:label id="lab_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39_label_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">property subject to operating lease, net rentable area</link:label>
    <link:label id="lab_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39_documentation_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">property subject to operating lease, net rentable area = net rentable space in square feet</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PropertySubjectToOperatingLeaseNetRentableArea" xlink:label="loc_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39" xlink:to="lab_omcl_PropertySubjectToOperatingLeaseNetRentableArea_BA46070A2FBC2415AC967A7E020E5D39" xlink:type="arc" />
    <link:label id="lab_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC_terseLabel_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">property subject to operating lease term duration</link:label>
    <link:label id="lab_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC_label_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">property subject to operating lease term duration</link:label>
    <link:label id="lab_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC_documentation_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">property subject to operating lease term duration - future or remaining base term in months</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PropertySubjectToOperatingLeaseTermDuration" xlink:label="loc_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC" xlink:to="lab_omcl_PropertySubjectToOperatingLeaseTermDuration_7BBE65F61771192B1D0C7A7E020E1CEC" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesRentExpenseMinimumRentals_B037BBF7F9A5858375327A7E020E034E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesRentExpenseMinimumRentals_B037BBF7F9A5858375327A7E020E034E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense, Minimum Rentals</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesRentExpenseMinimumRentals_B037BBF7F9A5858375327A7E020E034E_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesRentExpenseMinimumRentals_B037BBF7F9A5858375327A7E020E034E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense, Minimum Rentals</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingLeasesRentExpenseMinimumRentals" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseMinimumRentals_B037BBF7F9A5858375327A7E020E034E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesRentExpenseMinimumRentals_B037BBF7F9A5858375327A7E020E034E" xlink:to="lab_us-gaap_OperatingLeasesRentExpenseMinimumRentals_B037BBF7F9A5858375327A7E020E034E" xlink:type="arc" />
    <link:label id="lab_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19_terseLabel_en-US" xlink:label="lab_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">property subject to lease, 1st extension term duration</link:label>
    <link:label id="lab_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19_label_en-US" xlink:label="lab_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">property subject to lease, original term</link:label>
    <link:label id="lab_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19_documentation_en-US" xlink:label="lab_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">property subject to lease is the length of the original term (base period) of lease, from date of control of property to end of base term</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PropertySubjectToLeaseOriginalTerm" xlink:label="loc_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19" xlink:to="lab_omcl_PropertySubjectToLeaseOriginalTerm_385A78F924EC1365FB707A7E020F6D19" xlink:type="arc" />
    <link:label id="lab_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C_terseLabel_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property subject to operating lease, 2nd extension term duration</link:label>
    <link:label id="lab_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C_label_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property subject to operating lease, 2nd extension term duration</link:label>
    <link:label id="lab_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C_documentation_en-US" xlink:label="lab_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Property subject to operating lease, 2nd extension term duration (in months)</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration" xlink:label="loc_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C" xlink:to="lab_omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration_8218E5B6EA708BA2B8577A7E020F6C9C" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseExpirationDate1_01770EAEC80C9E9807127A7E020F544D_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseExpirationDate1_01770EAEC80C9E9807127A7E020F544D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease Expiration Date</link:label>
    <link:label id="lab_us-gaap_LeaseExpirationDate1_01770EAEC80C9E9807127A7E020F544D_label_en-US" xlink:label="lab_us-gaap_LeaseExpirationDate1_01770EAEC80C9E9807127A7E020F544D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Expiration Date</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="loc_us-gaap_LeaseExpirationDate1_01770EAEC80C9E9807127A7E020F544D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseExpirationDate1_01770EAEC80C9E9807127A7E020F544D" xlink:to="lab_us-gaap_LeaseExpirationDate1_01770EAEC80C9E9807127A7E020F544D" xlink:type="arc" />
    <link:label id="lab_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43_terseLabel_en-US" xlink:label="lab_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">property subject to lease, 1st extension term duration</link:label>
    <link:label id="lab_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43_label_en-US" xlink:label="lab_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">property subject to lease, 1st extension term duration</link:label>
    <link:label id="lab_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43_documentation_en-US" xlink:label="lab_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">property subject to lease, 1st extension term duration (in months)</link:label>
    <link:loc xlink:href="omcl-20130930.xsd#omcl_PropertySubjectToLease1StExtensionTermDuration" xlink:label="loc_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43" xlink:to="lab_omcl_PropertySubjectToLease1StExtensionTermDuration_85659B6105CD07AB9E957A7E020F0B43" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementLocationAxis_5E8C28F32BFE430DAD727A7E01B223AD_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_5E8C28F32BFE430DAD727A7E01B223AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
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    <link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_A57797A09FB5AC6066017A7E01EEE7EA_label_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_A57797A09FB5AC6066017A7E01EEE7EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision for Doubtful Accounts</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_A57797A09FB5AC6066017A7E01EEE7EA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensation_64D9DB896BC8FC4231347A7E01EE8F4F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_64D9DB896BC8FC4231347A7E01EE8F4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation expense</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_64D9DB896BC8FC4231347A7E01EE8F4F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_64D9DB896BC8FC4231347A7E01EE8F4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
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    <link:label id="lab_us-gaap_TaxBenefitFromStockOptionsExercised1_AC1ED9BC3D87FA164D1F7A7E01EF3FF3_terseLabel_en-US" xlink:label="lab_us-gaap_TaxBenefitFromStockOptionsExercised1_AC1ED9BC3D87FA164D1F7A7E01EF3FF3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income tax benefits from employee stock plans</link:label>
    <link:label id="lab_us-gaap_TaxBenefitFromStockOptionsExercised1_AC1ED9BC3D87FA164D1F7A7E01EF3FF3_label_en-US" xlink:label="lab_us-gaap_TaxBenefitFromStockOptionsExercised1_AC1ED9BC3D87FA164D1F7A7E01EF3FF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Benefit from Stock Options Exercised</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TaxBenefitFromStockOptionsExercised1" xlink:label="loc_us-gaap_TaxBenefitFromStockOptionsExercised1_AC1ED9BC3D87FA164D1F7A7E01EF3FF3" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_D05B2932F6AE312411637A7E01EF3F10" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryWriteDown_885B1E2F0E64F39A7D487A7E01EF75F6_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryWriteDown_885B1E2F0E64F39A7D487A7E01EF75F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for excess and obsolete inventories</link:label>
    <link:label id="lab_us-gaap_InventoryWriteDown_885B1E2F0E64F39A7D487A7E01EF75F6_label_en-US" xlink:label="lab_us-gaap_InventoryWriteDown_885B1E2F0E64F39A7D487A7E01EF75F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory Write-down</link:label>
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    <link:label id="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_47B184670A2B9D9694497A7E01EF56E9_negatedLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_47B184670A2B9D9694497A7E01EF56E9" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Foreign currency remeasurement loss</link:label>
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    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_2BCA1C0916D510C9BFF17A7E01EF3284_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_2BCA1C0916D510C9BFF17A7E01EF3284" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_A42CDA744B6D19B169A77A7E01EF5205_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_A42CDA744B6D19B169A77A7E01EF5205" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other assets</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_610350FBA38F6275C46E7A7E01EF698A_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_610350FBA38F6275C46E7A7E01EF698A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_610350FBA38F6275C46E7A7E01EF698A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_E5A68E534442B3A0C4EA7A7E01EF45F2_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_E5A68E534442B3A0C4EA7A7E01EF45F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred service revenue</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_E5A68E534442B3A0C4EA7A7E01EF45F2" xlink:type="locator" />
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    <link:label id="lab_omcl_IncreaseDecreaseInDeferredGrossProfit_B745A15D1EDE0165D7247A7E01F0C41A_terseLabel_en-US" xlink:label="lab_omcl_IncreaseDecreaseInDeferredGrossProfit_B745A15D1EDE0165D7247A7E01F0C41A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred gross profit</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireIntangibleAssets_2D64C9220C61EC928FF67A7E01F057C0_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireIntangibleAssets_2D64C9220C61EC928FF67A7E01F057C0" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Acquisition of intangible assets and intellectual property</link:label>
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    <link:label id="lab_omcl_PaymentsOfSoftwareDevelopmentForExternalUse_3BFD13B2F23D45DDCB7E7A7E01F0A9BA_negatedLabel_en-US" xlink:label="lab_omcl_PaymentsOfSoftwareDevelopmentForExternalUse_3BFD13B2F23D45DDCB7E7A7E01F0A9BA" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Software development for external use</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_F7183AED6EC9A4E82D1B7A7E01F0D405_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_F7183AED6EC9A4E82D1B7A7E01F0D405" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided from financing activities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_F7183AED6EC9A4E82D1B7A7E01F0D405" xlink:type="locator" />
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    <link:label id="lab_omcl_AtThe70thPercentileRankingDomain_90A256C6563944F62F7C33B58F8A4DBA_terseLabel_en-US" xlink:label="lab_omcl_AtThe70thPercentileRankingDomain_90A256C6563944F62F7C33B58F8A4DBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">At The 70th Percentile Ranking [Domain]</link:label>
    <link:label id="lab_omcl_AtThe70thPercentileRankingDomain_90A256C6563944F62F7C33B58F8A4DBA_label_en-US" xlink:label="lab_omcl_AtThe70thPercentileRankingDomain_90A256C6563944F62F7C33B58F8A4DBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">At The 70th Percentile Ranking [Domain]</link:label>
    <link:label id="lab_omcl_AtThe70thPercentileRankingDomain_90A256C6563944F62F7C33B58F8A4DBA_documentation_en-US" xlink:label="lab_omcl_AtThe70thPercentileRankingDomain_90A256C6563944F62F7C33B58F8A4DBA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">At The 70th Percentile Ranking [Domain]=Percentile ranking of total shareholder return is a the 70th percentile for purposes of further PSU vesting (Program Yr one only)</link:label>
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    <link:label id="lab_omcl_Below65ThPercentileRankingMember_B3DF31DD6DF12C48639E33B58F8A09CC_terseLabel_en-US" xlink:label="lab_omcl_Below65ThPercentileRankingMember_B3DF31DD6DF12C48639E33B58F8A09CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Below the 65th percentile ranking [Member]</link:label>
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    <link:label id="lab_omcl_Below65ThPercentileRankingMember_B3DF31DD6DF12C48639E33B58F8A09CC_documentation_en-US" xlink:label="lab_omcl_Below65ThPercentileRankingMember_B3DF31DD6DF12C48639E33B58F8A09CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Below the 65th percentile ranking [Member] = at least at the 50th percentile, but below the 65th percentile for purposes of further PSU vesting</link:label>
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    <link:label id="lab_omcl_AtOrAbove75ThPercentileRankingMember_9B738CE8E69D07801BD233B58F8AA74B_terseLabel_en-US" xlink:label="lab_omcl_AtOrAbove75ThPercentileRankingMember_9B738CE8E69D07801BD233B58F8AA74B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">At or above the 75th percentile ranking [Member]</link:label>
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