William Mentzer, M.D.
NPI 1255430146 · Pediatric Hematology & Oncology Physician · San Francisco, CA
William Mentzer, M.D. is a Pediatric Hematology & Oncology Physician provider in San Francisco, CA (NPI 1255430146).
Provider details
- NPI number
- 1255430146
- Entity type
- Individual
- Primary specialty
- Pediatric Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G11921 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-21
- Last updated
- 2012-08-24
Frequently asked questions
- What is William Mentzer's NPI number?
- William Mentzer's National Provider Identifier (NPI) is 1255430146, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mentzer's specialty?
- William Mentzer is listed in the NPPES registry with a primary specialty of Pediatric Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Mentzer located?
- William Mentzer's practice location on file with NPPES is 505 Parnassus Ave # M649, San Francisco, CA 94143-2204.
- What is William Mentzer's phone number?
- The practice phone number listed in the NPPES registry for William Mentzer is (415) 476-1280.
- Is William Mentzer's NPI active?
- Yes — William Mentzer's NPI (1255430146) is active in the NPPES registry as of the last update on 2012-08-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.