Gary A. Greensweig, D.O.
Family Medicine Physician · Belmont, CA
Gary A. Greensweig, D.O. is a family medicine physician with a practice address in Belmont, California, and NPI 1518970409, issued on Aug 14, 2006. Check the license (California 20A4368, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gary A. Greensweig
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A4368 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1301 Shoreway RD, Belmont, CA 94002
- Phone
- (650) 596-7000
- Enumerated
- Aug 14, 2006
- Record last updated
- Dec 11, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (650) 596-7093
- Medicare enrollment
- Enrolled (PECOS I20050801001302); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1301 Shoreway RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gary A. Greensweig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A4368Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
32 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Dignity Health Medical FoundationMerced, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gary A. Greensweig among 17,133 family medicine physician records in California
Gary A. Greensweig, D.O. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1976 · median 2005 among the 10,652 with a school on file
- Record last updated2012 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 family medicine physician records list a practice address in Belmont
They are 8 of the 324 NPPES records with a practice address in Belmont, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Belmont → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Adil Jadallah, M.D.Belmont, CA 940021780772376
- Uyen Le, M.D.Belmont, CA 940021598016636
- Nina Lippey, DOBelmont, CA 940021508420555
- Jolly PhilipBelmont, CA 940021487653556
- Christopher SmithBelmont, CA 940021881199909
- Brian XieuBelmont, CA 940021295475457
- Matthew Yu, DOBelmont, CA 940021811575301
- Mark Beltran, MDBurlingame, CA 940101801834601
Common questions
What is Gary A. Greensweig, D.O.'s NPI number?
Gary A. Greensweig, D.O.'s National Provider Identifier (NPI) is 1518970409, issued on Aug 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary A. Greensweig, D.O. located?
The NPPES record lists a practice address at 1301 Shoreway RD, Belmont, CA, 94002. Phone: (650) 596-7000. Providers update this record themselves, so call before visiting.
How can I verify Gary A. Greensweig, D.O.'s license?
NPPES lists California license number 20A4368, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gary A. Greensweig, D.O. prescribe under Medicare Part D?
In 2024, Gary A. Greensweig, D.O. had 32 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.