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Compare the published Medicare service mix of Glenn Harold Littell, M.D. with clinicians in the same registry specialty: Pathology (CMS).

CA · Exact areaEdit location

2024 published service data · 500 eligible profiles compared. This search reached its 500-profile comparison limit, using NPI order. Narrow the location for a more focused comparison. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Shulan Tian, M.D.

Pathology (CMS) · Glendale, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
93%Service-mix similarityView profile →

Chandrika Seneviratne, M.D.

Pathology (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
92%Service-mix similarityView profile →

Michele M Cosgrove, M.D.

Pathology (CMS) · Glendale, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
89%Service-mix similarityView profile →

Lawrence Browning Willes, MD

Pathology (CMS) · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
89%Service-mix similarityView profile →

Ruth Zhang

Pathology (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
89%Service-mix similarityView profile →

Chandnish K Ahluwalia, M.D.

Pathology (CMS) · Glendale, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
88%Service-mix similarityView profile →

Ann Zera Tan, M.D.

Pathology (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
87%Service-mix similarityView profile →

Octavio Armas, M.D.

Pathology (CMS) · La Mesa, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
86%Service-mix similarityView profile →

Joshua Isaac Segal, M.D.

Pathology (CMS) · Thousand Oaks, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
86%Service-mix similarityView profile →

John Yamashita, M.D.

Pathology (CMS) · Mission Hills, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
86%Service-mix similarityView profile →

Qi Cao, MD

Pathology (CMS) · Burbank, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
86%Service-mix similarityView profile →

Xiangdong Bu, MD

Pathology (CMS) · San Gabriel, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to examine tissue, initial procedure (88342)
  • Special stained specimen slides to examine tissue, each additional procedure (88341)
85%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.