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Compare the published Medicare service mix of John Gunn Lee, MD with clinicians in the same registry specialty: Gastroenterology · Internal Medicine (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.

Jason Buddika Samarasena, M.D.

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasound exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43259)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
64%Service-mix similarityView profile →

Piotr Szczepan Sowa, M.D.

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasound exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43259)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
57%Service-mix similarityView profile →

Usman G Rahim, M.D.

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasound exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43259)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
49%Service-mix similarityView profile →

Hardeep M Singh, M.D.

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasound exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43259)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
38%Service-mix similarityView profile →

William E Karnes, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Removal of large bowel tissue using a flexible endoscope (45390)
38%Service-mix similarityView profile →

Sandra Sunhee Park, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
37%Service-mix similarityView profile →

C Gregory Albers, MD

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
37%Service-mix similarityView profile →

Shravani Reddy, M.D

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
37%Service-mix similarityView profile →

George Holman, MD

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
35%Service-mix similarityView profile →

Christina Ling, M.D.

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
33%Service-mix similarityView profile →

Robert Ian Maurice Fearn, MBCHB

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
32%Service-mix similarityView profile →

Jaehyun Kim, MD

Gastroenterology (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
31%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.