John Maa, MD
NPI 1356305866 · Surgery Physician · Greenbrae, CA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Maa, MD is a Surgery Physician provider in Greenbrae, CA (NPI 1356305866).
Provider details
- NPI number
- 1356305866
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A55909 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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)
- 400 Parnassus AveSan Francisco, CA 94143-2202Phone: (415) 353-2161Fax: (415) 353-2505
Registry dates
- Enumerated
- 2006-04-12
- Last updated
- 2018-03-17
Frequently asked questions
- What is John Maa's NPI number?
- John Maa's National Provider Identifier (NPI) is 1356305866, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Maa's specialty?
- John Maa is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is John Maa located?
- John Maa's practice location on file with NPPES is 250 Bon Air Rd, Greenbrae, CA 94904-1702.
- What is John Maa's phone number?
- The practice phone number listed in the NPPES registry for John Maa is (415) 924-2515.
- Does John Maa accept Medicare?
- John Maa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Maa's NPI active?
- Yes — John Maa's NPI (1356305866) is active in the NPPES registry as of the last update on 2018-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.