Gary Birnbaum, MD
NPI 1912055807 · Geriatric Medicine (Family Medicine) Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gary Birnbaum, MD is a Geriatric Medicine (Family Medicine) Physician provider in San Diego, CA (NPI 1912055807).
Provider details
- NPI number
- 1912055807
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Family Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G46249 (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
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
- 2007-01-08
- Last updated
- 2021-11-22
Frequently asked questions
- What is Gary Birnbaum's NPI number?
- Gary Birnbaum's National Provider Identifier (NPI) is 1912055807, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Birnbaum's specialty?
- Gary Birnbaum is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Family Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Birnbaum located?
- Gary Birnbaum's practice location on file with NPPES is 4647 Zion Ave, San Diego, CA 92120-2507.
- What is Gary Birnbaum's phone number?
- The practice phone number listed in the NPPES registry for Gary Birnbaum is (619) 528-5000.
- Does Gary Birnbaum accept Medicare?
- Gary Birnbaum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gary Birnbaum's NPI active?
- Yes — Gary Birnbaum's NPI (1912055807) is active in the NPPES registry as of the last update on 2021-11-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.