Jeffrey Mason, M.D.
NPI 1255308912 · Endocrinology, Diabetes & Metabolism Physician · La Verne, CA
Jeffrey Mason, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in La Verne, CA (NPI 1255308912).
Provider details
- NPI number
- 1255308912
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- License
- G32644 (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
- 2006-03-01
- Last updated
- 2007-07-08
Frequently asked questions
- What is Jeffrey Mason's NPI number?
- Jeffrey Mason's National Provider Identifier (NPI) is 1255308912, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jeffrey Mason's specialty?
- Jeffrey Mason is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Jeffrey Mason located?
- Jeffrey Mason's practice location on file with NPPES is 5670 Shemiran St, La Verne, CA 91750-2380.
- What is Jeffrey Mason's phone number?
- The practice phone number listed in the NPPES registry for Jeffrey Mason is (909) 593-4079.
- Is Jeffrey Mason's NPI active?
- Yes — Jeffrey Mason's NPI (1255308912) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.