Charles Hsiao-Kung Feng, MD
Allergy/Immunology (CMS) · Mountain View, CA
Shared published services3 shared services · view billing descriptions
96%Service-mix similarityView profile →
Similar work.
More providers to explore.
Compare the published Medicare service mix of Patty Peng-Jung Chi, MD with clinicians in the same registry specialty: Allergy/Immunology · Internal Medicine (CMS).
MOUNTAIN VIEW, CA · Exact areaEdit location
2024 published service data · 3 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.
Jamila C. Martin, M.D.
Allergy/Immunology (CMS) · Mountain View, CA
Shared published services3 shared services · view billing descriptions
94%Service-mix similarityView profile →
Cindy Mai Nguyen, D.O.
Allergy/Immunology (CMS) · Mountain View, CA
Shared published services3 shared services · view billing descriptions
86%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.