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Compare the published Medicare service mix of Mark A Brubaker, M.D. with clinicians in the same registry specialty: Internal Medicine.

BRONX, NY · Exact areaEdit location

2024 published service data · 481 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Zsuzsanna Sidlo, MD PHD

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
93%Service-mix similarityView profile →

Saira Akhtar, MD

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
93%Service-mix similarityView profile →

Dillan Sooyong Chai

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
92%Service-mix similarityView profile →

Colin David Cha Fong, MD MBA

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
92%Service-mix similarityView profile →

Jill S. Waldman, M.D.

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
91%Service-mix similarityView profile →

Kamaldeep Singh, M.D.

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
91%Service-mix similarityView profile →

Amr Abdulhalem Ahmed Shier, MD

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
90%Service-mix similarityView profile →

Johnny Hubert Johnson, M.D.

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
90%Service-mix similarityView profile →

Sidra Raza

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
90%Service-mix similarityView profile →

Vaniza Mehak

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
90%Service-mix similarityView profile →

Aditya Hublikar, MD

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
89%Service-mix similarityView profile →

Luke Richard Sponholz, M.D.

Internal Medicine · Bronx, NY

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Hospital discharge day management, 30 minutes or less (99238)
  • Hospital discharge day management, more than 30 minutes (99239)
88%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.