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Compare the published Medicare service mix of Paul Leonor, M.D. with clinicians in the same registry specialty: Gastroenterology · Internal Medicine (CMS).

LOS ANGELES, CA · Exact areaEdit location

2024 published service data · 102 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Jacques Van Dam, M.D., PH.D.

Gastroenterology · Internal Medicine (CMS) · Los Angeles, 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)
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
  • Insertion of stent into pancreatic or bile duct using a flexible endoscope (43274)
78%Service-mix similarityView profile →

Stephen Kim, MD

Gastroenterology (CMS) · Los Angeles, 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)
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
  • Removal of stone or debris from bile or pancreatic duct using a flexible endoscope (43264)
60%Service-mix similarityView profile →

James Leonard Buxbaum, M.D.

Gastroenterology · Internal Medicine (CMS) · Los Angeles, 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)
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
  • Removal of stone or debris from bile or pancreatic duct using a flexible endoscope (43264)
54%Service-mix similarityView profile →

Ara Sahakian, M.D.

Gastroenterology · Internal Medicine (CMS) · Los Angeles, 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)
  • Removal of stone or debris from bile or pancreatic duct using a flexible endoscope (43264)
  • Insertion of stent into pancreatic or bile duct using a flexible endoscope (43274)
52%Service-mix similarityView profile →

Alexander H Kim, D.O.

Gastroenterology (CMS) · Los Angeles, 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)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
51%Service-mix similarityView profile →

Adnan Ameer, M.D.

Gastroenterology (CMS) · Los Angeles, 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)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
50%Service-mix similarityView profile →

Simon K Lo, M.D.

Gastroenterology (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
  • Removal of stone or debris from bile or pancreatic duct using a flexible endoscope (43264)
  • Insertion of stent into pancreatic or bile duct using a flexible endoscope (43274)
49%Service-mix similarityView profile →

Rahul K Chhablani, MD

Gastroenterology (CMS) · Los Angeles, 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)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
48%Service-mix similarityView profile →

Aaron Lee, MD

Gastroenterology (CMS) · Los Angeles, 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)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
47%Service-mix similarityView profile →

Venkataraman Raman Muthusamy, MD

Gastroenterology · Internal Medicine (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
  • Removal of stone or debris from bile or pancreatic duct using a flexible endoscope (43264)
  • Insertion of stent into pancreatic or bile duct using a flexible endoscope (43274)
47%Service-mix similarityView profile →

Gaurav Syal, M.D.

Gastroenterology · Internal Medicine (CMS) · Los Angeles, 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)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
47%Service-mix similarityView profile →

Elliott A Birnstein, M.D.

Gastroenterology (CMS) · Los Angeles, 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)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
46%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.