William MosierMD
William Mosier, MD is an Ophthalmology provider in Fullerton, CA affiliated with 2 ambulatory surgery centers in CA, as of July 2026.
- NPI1063553378
- Registered2007
- Centers2
- StateCA
- Class of1983
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.
William Mosier at a glance
- Provider
- William Mosier
- Credential
- MD
- Specialty
- Ophthalmology
- Procedures
- Ophthalmology CPT codes
- Location
- Fullerton, CA
- Medical school
- University of California, Irvine, California College of Medicine
- Graduated
- 1983
- NPI registered
- 2007
- NPI
- 1063553378
- 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 William Mosier practice?
William Mosier, MD is based in Fullerton, CA and is affiliated with 2 ambulatory surgery centers: La Veta Surgical Center in Orange, CA and Orange ASC LLC in Orange, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is William Mosier's NPI number?
William Mosier's National Provider Identifier (NPI) is 1063553378, registered in 2007. Specialty on record: Ophthalmology; credential MD.
Where did William Mosier go to medical school?
William Mosier, MD attended University of California, Irvine, California College of Medicine, graduating in 1983.
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, William Mosier among them. The California Ophthalmology directory lists each one by city with credential, NPI, and center affiliations.
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