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

Dr. William C. Mentzer, MD

Individual provider Pediatrics Physician · NPI 1255430146

Dr. William C. Mentzer, MD is a Pediatrics Physician in San Francisco, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
Specialties on file
2
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

505 Parnassus Ave # M649
San Francisco, CA 94143-2204
Phone: (415) 476-1280
Fax: (415) 502-4372
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Specialties & licences

Pediatric Hematology & Oncology Physician (primary) Taxonomy 2080P0207X · Licence G11921 (CA)
Pediatrics Physician Taxonomy 208000000X · Licence G11921 (CA)

Record details

NPI number1255430146
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 21, 2006
Last updated in NPPESAugust 24, 2012

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