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

Dr. William Sierra, MD

Individual provider Ophthalmology Physician · NPI 1275552796

Dr. William Sierra, MD is an Ophthalmology Physician in Los Angeles, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
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

4754 E Cesar E Chavez Ave
Los Angeles, CA 90022-1234
Phone: (323) 909-0041
Fax: (323) 909-0042
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence G32593 (CA)

Record details

NPI number1275552796
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 18, 2006
Last updated in NPPESAugust 23, 2016

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