HCPList Know more before you call. About
A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

Compare the published Medicare service mix of John F. Brennan, MD with clinicians in the same registry specialty: Internal Medicine · Nephrology (CMS).

WI · Exact areaEdit location

2024 published service data · 155 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Somsak Tanawattanacharoen, MD

Internal Medicine · Nephrology (CMS) · Eau Claire, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
77%Service-mix similarityView profile →

Christoph H Eggert, M.D.

Nephrology (CMS) · Fitchburg, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
75%Service-mix similarityView profile →

Daniel Guerra Rodas, M.D.

Nephrology (CMS) · Madison, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
74%Service-mix similarityView profile →

Lisa Haller, M.D.

Internal Medicine · Nephrology (CMS) · Glendale, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
70%Service-mix similarityView profile →

Sumaira Talib Shaikh, MD

Internal Medicine · Nephrology (CMS) · Janesville, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
68%Service-mix similarityView profile →

Carlos R Galvao-Sobrinho, MD, PHD

Nephrology (CMS) · Mount Pleasant, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
67%Service-mix similarityView profile →

Imran Sajjad, MD

Internal Medicine · Nephrology (CMS) · Waukesha, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
66%Service-mix similarityView profile →

Ahmed Malik, M.D.

Internal Medicine · Nephrology (CMS) · Milwaukee, WI

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
64%Service-mix similarityView profile →

Ehteshamul Haque Anjum, M.D.

Internal Medicine · Nephrology (CMS) · Janesville, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
63%Service-mix similarityView profile →

Loganathan Elangovan, MD

Nephrology (CMS) · Waukesha, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
62%Service-mix similarityView profile →

Omer Afzal, M.D.

Internal Medicine · Nephrology (CMS) · Waukesha, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
62%Service-mix similarityView profile →

Motasem Mohd F Ghazi Alkhasoneh

Nephrology (CMS) · Milwaukee, WI

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)
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
60%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.