Stephen Massa, M. D.
NPI 1710938584 · Neurology Physician · San Francisco, CA
Enrolled with Medicare as Order and Referring Only - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Massa, M. D. is a Neurology Physician provider in San Francisco, CA (NPI 1710938584).
Provider details
- NPI number
- 1710938584
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M. D.
- Sex
- Male
- Sole proprietor
- No
- License
- G57165 (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
1 documented practice location
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
Registry dates
- Enumerated
- 2006-05-15
- Last updated
- 2007-07-12
Frequently asked questions
- What is Stephen Massa's NPI number?
- Stephen Massa's National Provider Identifier (NPI) is 1710938584, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Massa's specialty?
- Stephen Massa is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Massa located?
- Stephen Massa's practice location on file with NPPES is 4150 Clement St, San Francisco, CA 94121-1545.
- What is Stephen Massa's phone number?
- The practice phone number listed in the NPPES registry for Stephen Massa is (415) 221-4810.
- Does Stephen Massa accept Medicare?
- Stephen Massa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Massa's NPI active?
- Yes — Stephen Massa's NPI (1710938584) is active in the NPPES registry as of the last update on 2007-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.