<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa_driscoll.txt
<DESCRIPTION>EDGAR SUPPORTING DOCUMENT
<TEXT>
POWER OF ATTORNEY
      KNOW ALL BY THESE PRESENTS, that the undersigned
hereby constitutes and appoints Jereme M. Sylvain,
Christophe Cantenot and Naveen Gurudevan, as long as they
are providing services to DexCom, Inc. ("Company"), and
each of them, as his true and lawful attorney-in-fact to:

      (1)	execute for and on behalf of the undersigned,
in the undersigned's capacity as an officer and/or
director of the Company, any and all Form 3, 4 or 5
reports required to be filed by the undersigned in
accordance with Section 16(a) of the Securities Exchange
Act of 1934, as amended ("Exchange Act"), and the rules
and regulations thereunder with respect to transactions
in securities of the Company;
      (2)	do and perform any and all acts for and on
behalf of the undersigned which may be necessary or
desirable to complete and execute any such Form 3, 4 or 5
report and timely file such report with the U.S.
Securities and Exchange Commission and any stock exchange
or similar authority; and
      (3)	take any other action of any type whatsoever in
connection with the foregoing which, in the opinion of
such attorney-in-fact, may be of benefit to, in the best
interest of, or legally required by, the undersigned, it
being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned, pursuant
to this Power of Attorney, shall be in such form and
shall contain such terms and conditions as such attorney-
in-fact may approve in his discretion.
      The undersigned hereby grants to such attorney-in-
fact full power and authority to do and perform each and
every act and thing whatsoever requisite, necessary and
proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do if
personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such
attorney-in-fact, or her/his substitute or substitutes,
shall lawfully do or cause to be done by virtue of this
Power of Attorney and the rights and powers herein
granted.  The undersigned acknowledges that no such
attorney-in-fact, in serving in such capacity at the
request of the undersigned, is hereby assuming, nor is
the Company hereby assuming, any of the undersigned's
responsibilities to comply with Section 16 of the
Exchange Act.
        The undersigned agrees that such attorney-in-fact
may rely entirely on information furnished orally or in
writing by the undersigned to each such attorney-in-fact.
The undersigned further agrees that each attorney-in-fact
and the Company are not responsible for any errors or
omissions in such filings. The attorneys-in-fact and the
Company are not responsible for determining whether or
not the transactions reported could be matched with any
other transactions for the purpose of determining
liability for short-swing profits under Section 16(b).
      This Power of Attorney shall remain in full force
and effect until the undersigned is no longer required to
file Form 3, 4 or 5 reports with respect to the
undersigned's holdings of and transactions in securities
issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.
      IN WITNESS WHEREOF, the undersigned has caused this
Power of Attorney to be executed as of August 3, 2023.

/s/ Rimma Driscoll
Rimma Driscoll






</TEXT>
</DOCUMENT>
