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Compare the published Medicare service mix of Gulchin A Ergun, M.D. with clinicians in the same registry specialty: Gastroenterology (CMS).

HOUSTON, TX · Exact areaEdit location

2024 published service data · 182 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Reena Vijay Chokshi, MD

Gastroenterology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Study of esophagus to assess movement (91010)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
78%Service-mix similarityView profile →

Adrianne Van Norman, DO

Gastroenterology (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Study of esophagus to assess movement (91010)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
71%Service-mix similarityView profile →

Roy T Davee, MD

Gastroenterology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Study of esophagus to assess movement (91010)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Prolonged monitoring and recording of esophageal function through nasal tube with electrode (91038)
69%Service-mix similarityView profile →

Zubair Khan, M.D

Gastroenterology (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
68%Service-mix similarityView profile →

Aparna P. Kulkarni, MD

Specialty details in registry · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
67%Service-mix similarityView profile →

Yinghong Wang, MD, PHD

Gastroenterology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
66%Service-mix similarityView profile →

David Matthew Richards, MD

Gastroenterology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Study of esophagus to assess movement (91010)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
64%Service-mix similarityView profile →

Johanna Leigh Chan, M.D.

Gastroenterology (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
64%Service-mix similarityView profile →

Nabil Mansour, MD

Gastroenterology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
63%Service-mix similarityView profile →

Cristian Enrique Dominguez, M.D.

Gastroenterology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
63%Service-mix similarityView profile →

Madhav Desai, MD, MPH

Gastroenterology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
63%Service-mix similarityView profile →

Shawn Gurwara, M.D.

Gastroenterology (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
62%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.