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

SACRAMENTO, CA · Exact areaEdit location

2024 published service data · 291 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Nelson Chiang, M.D.

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
100%Service-mix similarityView profile →

Maria Persianinova, D.O.

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
100%Service-mix similarityView profile →

Fauzia Ullah, MD

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
100%Service-mix similarityView profile →

Lionel G Tan

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
78%Service-mix similarityView profile →

Negin Sobhani Lewis, M.D.

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
69%Service-mix similarityView profile →

Vinay Penmetcha, M.D.

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
64%Service-mix similarityView profile →

Vimal K. Mishra, MBBS

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
62%Service-mix similarityView profile →

Hema Manickam, MD

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
58%Service-mix similarityView profile →

Voltaire Sinigayan, M.D.

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
57%Service-mix similarityView profile →

Jonathan Howard Aron, M.D.

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
55%Service-mix similarityView profile →

Sangeeta Sharad Parulekar, D.O.

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
53%Service-mix similarityView profile →

Sindhu Addepalli, MD

Internal Medicine · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
53%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.