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Compare the published Medicare service mix of Brian S Williams, M.D. with clinicians in the same registry specialty: Hospitalist · Pediatric Medicine (CMS).

MADISON, WI · Exact areaEdit location

2024 published service data · 135 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Kraig T Kumfer, M.D.

Hospitalist (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th (G0316)
86%Service-mix similarityView profile →

Andrew Schaefer, M.D.

Hospitalist (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th (G0316)
84%Service-mix similarityView profile →

Peter A Gill, M.D.

Hospitalist (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th (G0316)
83%Service-mix similarityView profile →

Francisco Javier Castro, MD

Hospitalist (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
74%Service-mix similarityView profile →

Theodore Kim, M.D.

Hospitalist (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
74%Service-mix similarityView profile →

Nicole S. Christian, M.D.

Hospitalist (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
74%Service-mix similarityView profile →

Ruthanna Seidel, M.D.

Hospitalist (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
74%Service-mix similarityView profile →

Heather M Peto, MD

Hospitalist · Internal Medicine · Pediatric Medicine (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
74%Service-mix similarityView profile →

Sree Vidya Pilla, MD

Internal Medicine (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
74%Service-mix similarityView profile →

Anna K Bilhorn, MD

Hospitalist (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
74%Service-mix similarityView profile →

Abdul-Rahman Ihmoud Abusalim, MD

Hospitalist (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th (G0316)
74%Service-mix similarityView profile →

Ziad Sad Aldeen, MD

Hospitalist (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th (G0316)
67%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.