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Compare the published Medicare service mix of Douglas Reid Gellerman, MD with clinicians in the same registry specialty: Ophthalmology (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.

Marc A Mintz, DO

Ophthalmology (CMS) · Whittier, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
87%Service-mix similarityView profile →

R Philip Doss, M.D., FACS

Ophthalmology (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
74%Service-mix similarityView profile →

Jane Alison Semel, M.D.

Ophthalmology (CMS) · El Segundo, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
69%Service-mix similarityView profile →

Edgar Castro Aguilar, O.D.

Optometry (CMS) · Imperial, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Exam of visual field with extended testing (92083)
69%Service-mix similarityView profile →

Dan B Tran, M.D.

Ophthalmology (CMS) · Long Beach, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
68%Service-mix similarityView profile →

Lan Tuyet Nguyen, M.D.

Ophthalmology (CMS) · San Jose, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
67%Service-mix similarityView profile →

John C Shin, M.D.

Ophthalmology (CMS) · San Rafael, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
67%Service-mix similarityView profile →

Kala Swamynathan, M.D.

Ophthalmology (CMS) · Stockton, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
63%Service-mix similarityView profile →

Amin Ashrafzadeh, MD

Ophthalmology (CMS) · Modesto, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
62%Service-mix similarityView profile →

Daniel Lee, MD

Internal Medicine · Ophthalmology (CMS) · Turlock, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
57%Service-mix similarityView profile →

John Kelly Schofield, D.O.

Ophthalmology (CMS) · Santa Monica, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient complete exam of visual system (92014)
  • Imaging of retina (92134)
  • Imaging of optic nerve (92133)
56%Service-mix similarityView profile →

Kenneth Robert Diddie, M.D.

Ophthalmology (CMS) · Westlake Village, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • New patient complete exam of visual system (92004)
51%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.