Gary Greensweig, D.O.
NPI 1518970409 · Family Medicine Physician · Belmont, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gary Greensweig, D.O. is a Family Medicine Physician provider in Belmont, CA (NPI 1518970409).
Provider details
- NPI number
- 1518970409
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A4368 (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
- 2006-08-14
- Last updated
- 2012-12-11
Frequently asked questions
- What is Gary Greensweig's NPI number?
- Gary Greensweig's National Provider Identifier (NPI) is 1518970409, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Greensweig's specialty?
- Gary Greensweig is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Greensweig located?
- Gary Greensweig's practice location on file with NPPES is 1301 Shoreway Rd, Belmont, CA 94002-4151.
- What is Gary Greensweig's phone number?
- The practice phone number listed in the NPPES registry for Gary Greensweig is (650) 596-7000.
- Does Gary Greensweig accept Medicare?
- Gary Greensweig is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gary Greensweig's NPI active?
- Yes — Gary Greensweig's NPI (1518970409) is active in the NPPES registry as of the last update on 2012-12-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.