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Compare the published Medicare service mix of Timothy Wayne Robertson, O.D. with clinicians in the same registry specialty: Optometrist.

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.

Baljit Sohal, O.D

Optometrist · Marysville, CA

Shared published services
3 shared services · view billing descriptions
  • Microfluid analysis of tears (83861)
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
87%Service-mix similarityView profile →

Bradley Hamar, OD

Optometrist · Yuba City, CA

Shared published services
3 shared services · view billing descriptions
  • Microfluid analysis of tears (83861)
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
86%Service-mix similarityView profile →

Jeffrey Jino Jeong, O.D.

Optometrist · Pasadena, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
77%Service-mix similarityView profile →

Annie Tsuen Chin, O.D.

Optometrist · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
74%Service-mix similarityView profile →

Beverly Tu, OD

Optometrist · San Pedro, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
70%Service-mix similarityView profile →

Sara Farnaz Tavassoli, O.D.

Optometrist · Arcadia, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
70%Service-mix similarityView profile →

Kevin Thanh Phong Nguyen

Optometrist · Beverly Hills, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
69%Service-mix similarityView profile →

Kalina Ponsavanh Grimm, OD

Optometrist · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
69%Service-mix similarityView profile →

Matthew Cheung, OD

Optometrist · Monterey Park, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
69%Service-mix similarityView profile →

Anita Niederberger Huang, O.D.

Optometrist · Chula Vista, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
68%Service-mix similarityView profile →

Michael Wang, OD.

Optometrist · Elk Grove, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
68%Service-mix similarityView profile →

Les Alan Shipley, OD

Optometrist · Santa Rosa, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient problem focused exam of visual system (92012)
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
68%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.