Ryan Mcmahan, MD, MAS
NPI 1356978308 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ryan Mcmahan, MD, MAS is a Internal Medicine Physician provider in San Francisco, CA (NPI 1356978308).
Provider details
- NPI number
- 1356978308
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MAS
- Sex
- Male
- Sole proprietor
- Yes
- License
- A185859 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 1001 Potrero AveSan Francisco, CA 94110-3518Phone: (628) 206-8000
Registry dates
- Enumerated
- 2020-03-26
- Last updated
- 2025-10-06
- Certified
- 2025-10-06
Frequently asked questions
- What is Ryan Mcmahan's NPI number?
- Ryan Mcmahan's National Provider Identifier (NPI) is 1356978308, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ryan Mcmahan's specialty?
- Ryan Mcmahan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ryan Mcmahan located?
- Ryan Mcmahan's practice location on file with NPPES is 2425 Geary Blvd, San Francisco, CA 94115-3358.
- What is Ryan Mcmahan's phone number?
- The practice phone number listed in the NPPES registry for Ryan Mcmahan is (415) 833-2000.
- Does Ryan Mcmahan accept Medicare?
- Ryan Mcmahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ryan Mcmahan's NPI active?
- Yes — Ryan Mcmahan's NPI (1356978308) is active in the NPPES registry as of the last update on 2025-10-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.