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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Summary of Net Revenue) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | $ 1,430,061 | $ 1,315,077 | $ 1,071,840
Imaging center segment revenue |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 1,425,665 | 1,313,662 | 1,071,840
Commercial insurance |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 785,128 | 743,462 | 584,035
Medicare |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 311,124 | 280,911 | 217,928
Medicaid |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 38,279 | 34,731 | 25,619
Workers' compensation/personal injury |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 51,339 | 44,235 | 33,478
Other patient revenue |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 31,849 | 19,398 | 25,314
Management fee revenue |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 22,235 | 19,630 | 11,253
Software and teleradiology |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 14,238 | 10,525 | 10,798
Other |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 19,428 | 12,436 | 23,297
Revenue under capitation arrangements |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 152,045 | 148,334 | 140,118
AI segment revenue |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | $ 4,396 | $ 1,415 | $ 0

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