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Compare the published Medicare service mix of Usman G Rahim, M.D. with clinicians in the same registry specialty: Gastroenterology (CMS).

ORANGE, CA · Exact areaEdit location

2024 published service data · 32 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Piotr Szczepan Sowa, M.D.

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
72%Service-mix similarityView profile →

Shruti Mahindrakar Ariza, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
67%Service-mix similarityView profile →

Hardeep M Singh, M.D.

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
65%Service-mix similarityView profile →

Ousama Alkhatib, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
64%Service-mix similarityView profile →

David B Stanton, M.D.

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
62%Service-mix similarityView profile →

Jaehyun Kim, MD

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
59%Service-mix similarityView profile →

William E Karnes, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
59%Service-mix similarityView profile →

George Holman, MD

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
58%Service-mix similarityView profile →

Haig Najarian, MD

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
56%Service-mix similarityView profile →

James J Lee, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
56%Service-mix similarityView profile →

Alaa Abousaif, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
53%Service-mix similarityView profile →

Shravani Reddy, M.D

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43235)
53%Service-mix similarityView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in NPI order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.