Gregory John Martin, MD
Family Medicine Physician · San Francisco, CA
Gregory John Martin, MD is a family medicine physician with a practice address in San Francisco, California, and NPI 1619995867, issued on Jul 17, 2006. Check the license (California A52803, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory John Martin
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A52803 CA
Self-reported in NPPES; status is on the state search - Practice location
- 45 Castro St, San Francisco, CA 94114
- Phone
- (415) 600-6000
- Enumerated
- Jul 17, 2006
- Record last updated
- Jul 23, 2026
- Medicaid ID
- 00A528030 CA
- Medicare enrollment
- Enrolled (PECOS I20040405001413); 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 45 Castro St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory John Martin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A52803Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
130 Medicare Part D claims for 45 beneficiaries, 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 97.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Pacific Inpatient Medical GroupSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory John Martin among 17,133 family medicine physician records in California
Gregory John Martin, MD 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
- Graduated1983 · median 2005 among the 10,652 with a school on file
- Record last updated2026 · 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).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Francisco → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Nilda Alverio, MDSan Francisco, CA 941141184756116
- Sharon Braun, MDSan Francisco, CA 941141194937441
- Jessica ChanSan Francisco, CA 941141902211840
- Andrea GroszSan Francisco, CA 941141801214358
- Leslie Lane, MDSan Francisco, CA 941141942595624
- Patrick Lowerre, M.D.San Francisco, CA 941141912200338
- Jonathan Lynne, M.D.San Francisco, CA 941141982975892
- Daphne Miller, M.D.San Francisco, CA 941141538260054
Common questions
What is Gregory John Martin, MD's NPI number?
Gregory John Martin, MD's National Provider Identifier (NPI) is 1619995867, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory John Martin, MD located?
The NPPES record lists a practice address at 45 Castro St, San Francisco, CA, 94114. Phone: (415) 600-6000. Providers update this record themselves, so call before visiting.
How can I verify Gregory John Martin, MD's license?
NPPES lists California license number A52803, 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 Gregory John Martin, MD prescribe under Medicare Part D?
In 2024, Gregory John Martin, MD had 130 Medicare Part D claims for 45 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Gregory John Martin, MD's MIPS final score?
The 2023 MIPS final score is 97.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.