Mark WilliamsM.D.
Ophthalmology·Orange, CA
Mark Williams, M.D. is an Ophthalmology provider in Orange, CA affiliated with 2 ambulatory surgery centers in CA, as of July 2026.
- NPI1780118802
- Registered2017
- Centers2
- StateCA
- Class of2017
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Education
Education on record as of August 2026.
Mark Williams at a glance
- Provider
- Mark Williams
- Credential
- M.D.
- Specialty
- Ophthalmology
- Procedures
- Ophthalmology CPT codes
- Location
- Orange, CA
- Medical school
- University of California, San Francisco School of Medicine
- Graduated
- 2017
- NPI registered
- 2017
- NPI
- 1780118802
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Mark Williams practice?
Mark Williams, M.D. is based in Orange, CA and is affiliated with 2 ambulatory surgery centers: Orange ASC LLC in Orange, CA and Pavilion Surgery Center in Orange, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Mark Williams's NPI number?
Mark Williams's National Provider Identifier (NPI) is 1780118802, registered in 2017. Specialty on record: Ophthalmology; credential M.D.
Where did Mark Williams go to medical school?
Mark Williams, M.D. attended University of California, San Francisco School of Medicine, graduating in 2017.
How many Ophthalmology providers in California work at ambulatory surgery centers?
869 Ophthalmology surgeons and proceduralists in California are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Mark Williams among them. The California Ophthalmology directory lists each one by city with credential, NPI, and center affiliations.
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