Martin Stein, M. D.
NPI 1871901397 · Endocrinology, Diabetes & Metabolism Physician · Portola Valley, CA
Martin Stein, M. D. is a Endocrinology, Diabetes & Metabolism Physician provider in Portola Valley, CA (NPI 1871901397).
Provider details
- NPI number
- 1871901397
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M. D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- C26329 (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
11 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
- 2014-07-28
- Last updated
- 2014-07-28
Frequently asked questions
- What is Martin Stein's NPI number?
- Martin Stein's National Provider Identifier (NPI) is 1871901397, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Martin Stein's specialty?
- Martin Stein is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Martin Stein located?
- Martin Stein's practice location on file with NPPES is 145 Deer Meadow Ln, Portola Valley, CA 94028-7608.
- What is Martin Stein's phone number?
- The practice phone number listed in the NPPES registry for Martin Stein is (650) 529-1786.
- Is Martin Stein's NPI active?
- Yes — Martin Stein's NPI (1871901397) is active in the NPPES registry as of the last update on 2014-07-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.