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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. JEFFREY SCOTT MASON M.D.
NPI 1255308912
Internal Medicine - Endocrinology, Diabetes & Metabolism in La Verne, CA

Active since March 01, 2006
5670 SHEMIRAN ST, LA VERNE, CA 91750(909) 593-4079(951) 274-3056 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

About Dr. Jeffrey Scott Mason M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JEFFREY SCOTT MASON M.D. (NPI 1255308912) is an individual endocrinology, diabetes & metabolism provider in La Verne, California, licensed in California (G32644) and active in the NPI registry since March 2006.

NPPES Registry Identity

NPI1255308912
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameDR. JEFFREY SCOTT MASONCredential: M.D.
Location Address5670 SHEMIRAN STLa Verne, CA 91750-2380
Mailing Address5670 Shemiran StLa Verne, CA 91750-2380 · (909) 593-4079 · Fax (951) 274-3056
Phone(909) 593-4079
Fax(951) 274-3056
Sole ProprietorNo
Enumeration DateMarch 1, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1255308912 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in CA · G32644
Definition

An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.

5670 SHEMIRAN ST, La Verne, CA 91750
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Frequently Asked Questions

What is Jeffrey Mason's NPI number?

The NPI number assigned to this healthcare provider is 1255308912, enumerated as an "individual" on March 01, 2006.

Where is the provider located?

The provider is located at 5670 SHEMIRAN ST LA VERNE, CA 91750 and the phone number is (909) 593-4079.

What is the provider's specialty?

Internal Medicine with taxonomy code 207RE0101X and a focus in Endocrinology, Diabetes & Metabolism.