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

SAINT LOUIS, MO · Exact areaEdit location

2024 published service data · 110 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Koushik Kumar Das, MD

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
83%Service-mix similarityView profile →

Gabriel David Lang, MD

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
82%Service-mix similarityView profile →

Arvind Rengarajan, MD

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
82%Service-mix similarityView profile →

Michael Charles Bennett, MD

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less (96365)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Infusion into a vein for therapy, prevention, or diagnosis, each additional hour (96366)
74%Service-mix similarityView profile →

Vladimir Markovicl Kushnir, MD

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Review by radiologist of image from tube placement into bile duct using an endoscope (74328)
69%Service-mix similarityView profile →

Samuel Joseph Burton, M.D.

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • 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)
63%Service-mix similarityView profile →

David Lee Ulrich, M.D.

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • 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)
62%Service-mix similarityView profile →

Jason Gary Bill, MD

Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Removal of stone or debris from bile or pancreatic duct using a flexible endoscope (43264)
61%Service-mix similarityView profile →

Michael Ansstas, M.D.

Allergy/Immunology · Gastroenterology · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • 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)
59%Service-mix similarityView profile →

Nikhil Banerjee, M.D.

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less (96365)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
57%Service-mix similarityView profile →

Hugo A Villarreal, M.D.

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Removal of stone or debris from bile or pancreatic duct using a flexible endoscope (43264)
56%Service-mix similarityView profile →

Laura Ulmer, D.O

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Biopsy of large bowel using a flexible endoscope (45380)
56%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.