Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. William D Mosier, MD

Individual provider Ophthalmology Physician · NPI 1063553378

Dr. William D Mosier, MD is an Ophthalmology in Fullerton, California. Graduated from University of California, Irvine, California College of Medicine in 1983, 43 years ago. Practices with William D Mosier MD Inc a Professional Medical Corporation, a 3-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
43
Trained at
University of California, Irvine, California College of Medicine
Licensed in
CA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

265 Laguna Rd
Fullerton, CA 92835-2515
Phone: (714) 871-2570
Fax: (714) 441-2020
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence A41428 (CA)

Record details

NPI number1063553378
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedFebruary 9, 2007
Last updated in NPPESApril 11, 2014
Mailing address265 Laguna Rd, Fullerton, CA 92835-2515

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPHTHALMOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, IRVINE, CALIFORNIA COLLEGE OF MEDICINE
Graduated 1983 (43 years in practice)
Group practice William D Mosier Md Inc A Professional Medical Corporation — 3 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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