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Compare the published Medicare service mix of Donald J Kastens, MD with clinicians in the same registry specialty: Gastroenterology (CMS).

OKLAHOMA CITY, OK · Exact areaEdit location

2024 published service data · 53 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Ross Stanford Keener, M.D.

Gastroenterology · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
80%Service-mix similarityView profile →

Ijlal Akbar Ali, MD

Gastroenterology · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
80%Service-mix similarityView profile →

Sumit A Walia, MD

Gastroenterology · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
76%Service-mix similarityView profile →

Ravinder R Kurella, MD

Gastroenterology (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
75%Service-mix similarityView profile →

Justin Kosirog

Gastroenterology · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
74%Service-mix similarityView profile →

David A Neumann, MD

Gastroenterology · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
73%Service-mix similarityView profile →

Zachary Daniel Smith, M.D.

Gastroenterology · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
70%Service-mix similarityView profile →

William M Tierney, MD

Gastroenterology (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
70%Service-mix similarityView profile →

Salman Nusrat, M.D.

Gastroenterology (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
70%Service-mix similarityView profile →

Jean Abed, M.D.

Gastroenterology · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
69%Service-mix similarityView profile →

Hussein Bitar, MD

Gastroenterology (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
68%Service-mix similarityView profile →

Verapan Vongthavaravat, M.D.

Gastroenterology (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Insertion of guide wire with dilation of esophagus using a flexible endoscope (43248)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
68%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.