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

Ryan D. McMahan, MD, MAS

Individual provider Internal Medicine Physician · NPI 1356978308

Ryan D. McMahan, MD, MAS is a Geriatric Medicine in San Francisco, California. Qualified in 2020, 6 years ago. Practices with University of California Sfgh Medical Group, a 571-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
6
Licensed in
CA
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.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

2425 Geary Blvd
San Francisco, CA 94115-3358
Phone: (415) 833-2000
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1001 Potrero Ave, San Francisco, CA 94110-3518 — (628) 206-8000

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A185859 (CA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1356978308
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , MAS
Sole proprietorYes
NPI enumeratedMarch 26, 2020
Last updated in NPPESOctober 6, 2025
Certification dateOctober 6, 2025

Medicare enrollment

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

Medicare specialtyGERIATRIC MEDICINE
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice University Of California Sfgh Medical Group — 571 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Other providers in San Francisco