Stephen Gruber, M.D.
NPI 1932280377 · Clinical Genetics (M.D.) Physician · Duarte, CA
Enrolled with Medicare as Practitioner - Medical Genetics and Genomics · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Gruber, M.D. is a Clinical Genetics (M.D.) Physician provider in Duarte, CA (NPI 1932280377).
Provider details
- NPI number
- 1932280377
- Entity type
- Individual
- Primary specialty
- Clinical Genetics (M.D.) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G89235 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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)
- 209 Fair Oaks AveSouth Pasadena, CA 91030-1814Phone: (626) 396-2900
Registry dates
- Enumerated
- 2006-10-18
- Last updated
- 2023-03-29
- Certified
- 2023-03-29
Frequently asked questions
- What is Stephen Gruber's NPI number?
- Stephen Gruber's National Provider Identifier (NPI) is 1932280377, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Gruber's specialty?
- Stephen Gruber is listed in the NPPES registry with a primary specialty of Clinical Genetics (M.D.) Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Gruber located?
- Stephen Gruber's practice location on file with NPPES is 1500 Duarte Rd, Duarte, CA 91010-3012.
- What is Stephen Gruber's phone number?
- The practice phone number listed in the NPPES registry for Stephen Gruber is (626) 256-4673.
- Does Stephen Gruber accept Medicare?
- Stephen Gruber is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Gruber's NPI active?
- Yes — Stephen Gruber's NPI (1932280377) is active in the NPPES registry as of the last update on 2023-03-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.