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Compare the published Medicare service mix of Gregory Fung, MD with clinicians in the same registry specialty: Gastroenterology · Internal Medicine (CMS).

SAN FRANCISCO, CA · Exact areaEdit location

2024 published service data · 45 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Aristotle E Mendiola, M.D.

Gastroenterology (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
69%Service-mix similarityView profile →

Timothy Chen, M.D.

Gastroenterology (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
58%Service-mix similarityView profile →

Michael S Verhille, M.D.

Gastroenterology (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
57%Service-mix similarityView profile →

Robert J Elsen, M.D.

Gastroenterology (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
55%Service-mix similarityView profile →

Jesse Liu, MD

Gastroenterology · Internal Medicine (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
55%Service-mix similarityView profile →

James K. Yan, D.O.

Gastroenterology · Internal Medicine (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
49%Service-mix similarityView profile →

Yen N Quang, M.D.

Gastroenterology · Internal Medicine (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
42%Service-mix similarityView profile →

Annette Y. Kwon, MD

Gastroenterology · Internal Medicine (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
40%Service-mix similarityView profile →

Cathleen Nora Cabansag, MD

Gastroenterology · Internal Medicine (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
36%Service-mix similarityView profile →

Dennis D Shen, MD

Gastroenterology · Internal Medicine (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
36%Service-mix similarityView profile →

Thomas Ye Myint, M.D

Gastroenterology · Hospitalist (CMS) · San Francisco, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
33%Service-mix similarityView profile →

Laura S. Chiu, MD, MPH

Gastroenterology (CMS) · San Francisco, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
30%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.