Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Gregory John Martin, MD

Individual provider Family Medicine Physician · NPI 1619995867

Gregory John Martin, MD is a Family Practice in San Francisco, California. Qualified in 1983, 43 years ago. Practices with Pacific Inpatient Medical Group, a 128-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
43
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

45 Castro St
San Francisco, CA 94114-1010
Phone: (415) 600-6000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence A52803 (CA)

Record details

NPI number1619995867
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 17, 2006
Last updated in NPPESJuly 23, 2026
Certification dateJuly 23, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolOTHER
Graduated 1983 (43 years in practice)
Group practice Pacific Inpatient Medical Group — 128 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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