NPPES file of Aug 9, 2026

Retina Specialist (Ophthalmology) Physician in California

205 NPPES records list retina specialist (ophthalmology) physician with a practice address in California, 0.5 per 100,000 residents, the 13th highest rate of 48. Sacramento and San Diego have the most; each record links to the provider's NPI and the California license search. Page 5 of 5.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207WX0107X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Sacramento has the most, 22

  1. Sacramento22
  2. San Diego16
  3. Los Angeles12
  4. Stanford12
  5. San Francisco9

Retina Specialist (Ophthalmology) Physician records in California

  1. Mark Williams, M.D.Orange, CA 928681780118802
  2. Glenn Yiu, MD, PHDSacramento, CA 958171730348921
  3. Vitaliy Zak, M.D.Palm Desert, CA 922601669566535
  4. Kamal Zakka, MDBeverly Hills, CA 902121851914543
  5. Tailun Zhao, M.D.El Cajon, CA 920201952659203

Source: CMS NPPES, primary taxonomy 207WX0107X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 13 of 48 per resident

  1. Utah0.6
  2. Illinois0.6
  3. Florida0.5
  4. California0.5
  5. Arkansas0.5
  6. New York0.5
  7. 50 states and D.C.0.5

Source: CMS NPPES, primary taxonomy 207WX0107X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

97.6% of these records appear in a Medicare file, against 94.9% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. California97.6%
  2. United States94.9%

Retina Specialist (Ophthalmology) Physician records in California, measured

  • In a Medicare file200 of 205 · 97.6% here, 94.9% nationally
  • In the CMS Doctors and Clinicians file189 · 92.2% here, 89.1% nationally
  • Not updated in five years or more75 · 36.6% here, 42.0% nationally
  • Median graduation year2007 · the 189 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207WX0107X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

205 NPPES records list retina specialist (ophthalmology) physician (207WX0107X) as their primary taxonomy with a practice address in California: 0.5 per 100,000 residents against 0.5 nationally (50 states and D.C.). Sacramento has 22 of them (11%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Florida123
  2. Texas107
  3. New York102
  4. Ohio76

States with a similar rate per 100,000

  1. Arkansas0.5
  2. Virginia0.5
  3. Kentucky0.5
  4. Michigan0.5

The largest states

  1. Florida123
  2. Texas107
  3. New York102
  4. Ohio76
  5. Illinois72

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.