William Isenberg, MD
NPI 1265497101 · Obstetrics & Gynecology Physician · Oakland, CA
William Isenberg, MD is a Obstetrics & Gynecology Physician provider in Oakland, CA (NPI 1265497101).
Provider details
- NPI number
- 1265497101
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- G77313 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2006-04-20
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Isenberg's NPI number?
- William Isenberg's National Provider Identifier (NPI) is 1265497101, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Isenberg's specialty?
- William Isenberg is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is William Isenberg located?
- William Isenberg's practice location on file with NPPES is 365 Hawthorne Ave, Oakland, CA 94609.
- What is William Isenberg's phone number?
- The practice phone number listed in the NPPES registry for William Isenberg is (510) 893-1700.
- Is William Isenberg's NPI active?
- Yes — William Isenberg's NPI (1265497101) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.