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Compare the published Medicare service mix of Aaron B Greenspan, 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.

Joel Riley, M.D.

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

Shared published services
3 shared services · view billing descriptions
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of large bowel using a flexible endoscope (45380)
76%Service-mix similarityView profile →

Olayiwola C Olagbegi, M.D.

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
71%Service-mix similarityView profile →

Ted Walker, M.D.

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of large bowel using a flexible endoscope (45380)
71%Service-mix similarityView profile →

Sami Ali Almaskeen, M.D.

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of large bowel using a flexible endoscope (45380)
68%Service-mix similarityView profile →

Catherine Filley Howe, MD

Gastroenterology (CMS) · Saint Louis, MO

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 large bowel using a flexible endoscope (45380)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
67%Service-mix similarityView profile →

Laura Ulmer, D.O

Gastroenterology (CMS) · Saint Louis, MO

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 large bowel using a flexible endoscope (45380)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
67%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
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
67%Service-mix similarityView profile →

Ruben Ricardo Aymerich, MD

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Biopsy of large bowel using a flexible endoscope (45380)
66%Service-mix similarityView profile →

Elizabeth Joy Blaney, MD

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

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 large bowel using a flexible endoscope (45380)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
65%Service-mix similarityView profile →

Faiza Bhatti, M.D.,

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
65%Service-mix similarityView profile →

Jonathan Charles Seccombe, M.D.

Gastroenterology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
65%Service-mix similarityView profile →

Parul Gor, M.D.

Gastroenterology (CMS) · Saint Louis, MO

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 large bowel using a flexible endoscope (45380)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
64%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.