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

Dr. Gregory James Zahner, MD

Individual provider Internal Medicine Physician · NPI 1427685767

Dr. Gregory James Zahner, MD is an Internal Medicine in San Francisco, California. Graduated from University of California, San Francisco School of Medicine in 2020, 6 years ago. Practices with Regents of the University of California, a 717-clinician group and accepts Medicare assignment. Licensed in California and Massachusetts.

Years since qualifying
6
Trained at
University of California, San Francisco School of Medicine
Licensed in
CA, MA
In the registry since
2020
Specialties on file
2
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

505 Parnassus Ave
San Francisco, CA 94143-2204
Phone: (415) 476-1000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A201693 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 1013382 (MA)

Record details

NPI number1427685767
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 26, 2020
Last updated in NPPESAugust 8, 2025
Certification dateAugust 8, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, SAN FRANCISCO SCHOOL OF MEDICINE
Graduated 2020 (6 years in practice)
Group practice Regents Of The University Of California — 717 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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