A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

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

CORNING, CA · 25 milesEdit location
Within 25 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 19 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Dylan Franchi, OD

Optometrist · Chico, 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)
94%Service-mix similarity~24.9 milesView profile →

Craig Allan Montgomery, O.D.

Optometrist · Chico, 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)
93%Service-mix similarity~24.9 milesView profile →

Michael James Merry, OD

Optometrist · Chico, 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)
92%Service-mix similarity~24.9 milesView profile →

Jonathan Eric Mennucci, O.D.

Optometrist · Chico, 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)
90%Service-mix similarity~24.9 milesView profile →

Stacy Catherine Cullum, O.D.

Optometrist · Red Bluff, 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 similarity~17.4 milesView profile →

Jennifer Marie Levine, OD

Optometrist · Chico, 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)
64%Service-mix similarity~22.6 milesView profile →

Obbie Pennington, O.D.

Optometrist · Chico, 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)
62%Service-mix similarity~24.9 milesView profile →

Steven Warne, O.D.

Optometrist · Chico, CA

Shared published services
3 shared services · view billing descriptions
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
  • Established patient complete exam of visual system (92014)
55%Service-mix similarity~22.6 milesView profile →

Ryan Vikesland, OD

Optometrist · Chico, 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)
  • New patient complete exam of visual system (92004)
52%Service-mix similarity~22.6 milesView profile →

David Eric Clarke, OD

Optometrist · Chico, 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)
52%Service-mix similarity~19.5 milesView profile →

Anna Mary Griffith, O.D.

Optometrist · Chico, CA

Shared published services
3 shared services · view billing descriptions
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
  • Established patient complete exam of visual system (92014)
47%Service-mix similarity~19.5 milesView profile →

Aurora V Barriga, O.D.

Optometrist · Red Bluff, CA

Shared published services
3 shared services · view billing descriptions
  • Imaging of retina (92134)
  • Exam of visual field with extended testing (92083)
  • Established patient complete exam of visual system (92014)
39%Service-mix similarity~17.4 milesView 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 approximate distance 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.