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Compare the published Medicare service mix of John Andrew Grant, M.D. with clinicians in the same registry specialty: Neurosurgery (CMS).

NY · Exact areaEdit location

2024 published service data · 292 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

William M. Wirchansky, MD

Neurosurgery (CMS) · Brooklyn, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
74%Service-mix similarityView profile →

Jung Park

Neurosurgery (CMS) · Manhasset, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
67%Service-mix similarityView profile →

Kevin J Mansfield, MD

Neurosurgery (CMS) · Albany, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
67%Service-mix similarityView profile →

Daniel Green Eichberg, MD

Neurosurgery (CMS) · Great Neck, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
53%Service-mix similarityView profile →

Pui Man Rosalind Lai, MD

Neurosurgery (CMS) · Buffalo, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
52%Service-mix similarityView profile →

Henry Moyle, M.D.

Specialty details in registry · Cortlandt Manor, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
47%Service-mix similarityView profile →

Martin Zonenshayn, M.D.

Neurosurgery (CMS) · New York, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
46%Service-mix similarityView profile →

John Charles Dalfino, M.D.

Neurosurgery (CMS) · Albany, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
45%Service-mix similarityView profile →

Michael Ayad, MD PHD

Neurology · Neurosurgery (CMS) · Brooklyn, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
43%Service-mix similarityView profile →

Nicholas Field, M.D.

Neurosurgery (CMS) · Albany, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
41%Service-mix similarityView profile →

Christopher J Winfree, M.D.

Neurosurgery (CMS) · New York, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
38%Service-mix similarityView profile →

Darryl John Dirisio, M.D.

Neurosurgery (CMS) · Albany, NY

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
38%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.