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

CHICAGO, IL · Exact areaEdit location

2024 published service data · 158 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Alice Gabrielle Cheng, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
76%Service-mix similarityView profile →

Cemal Yazici, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
75%Service-mix similarityView profile →

Peter Kahrilas, MD

Specialty details in registry · Chicago, IL

Shared published services
1 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)
73%Service-mix similarityView profile →

Steven Flamm, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
73%Service-mix similarityView profile →

Nikunj Shah, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
72%Service-mix similarityView profile →

Ali Keshavarzian, M.D.

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
64%Service-mix similarityView profile →

Richard Green, MD

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
1 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)
57%Service-mix similarityView profile →

Nirmala Gonsalves, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
56%Service-mix similarityView profile →

Itishree Trivedi, MD

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
1 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)
54%Service-mix similarityView profile →

Eric R Kallwitz, M.D.

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
1 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)
52%Service-mix similarityView profile →

Nolan Woodard Faust, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
52%Service-mix similarityView profile →

Anna Maria Lipowska, M.D.

Gastroenterology (CMS) · Chicago, IL

Shared published services
1 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)
51%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.