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GREGORY R. MASON M.D.
NPI 1841247145
Internal Medicine - Pulmonary Disease in Torrance, CA

Active since May 30, 2006
21840 NORMANDIE AVE, STE. 700, TORRANCE, CA 90502(310) 222-5101(310) 320-5463 Get Directions Write a Review

NPPES record last updated: May 16, 2019. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Gregory R. Mason M.d. NPPES

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

GREGORY R. MASON M.D. (NPI 1841247145) is an individual pulmonary disease provider in Torrance, California, licensed in California (C36997) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1841247145
Entity TypeIndividualMale
Primary Taxonomy207RP1001X
Provider Legal NameGREGORY R. MASONCredential: M.D.
Location Address21840 NORMANDIE AVE, STE. 700Torrance, CA 90502-2047
Mailing Address21840 Normandie Ave, Ste. 700Torrance, CA 90502-2047 · (310) 222-5101 · Fax (310) 320-5463
Phone(310) 222-5101
Fax(310) 320-5463
Sole ProprietorNo
Enumeration DateMay 30, 2006
Last NPPES UpdateMay 16, 2019
✔ NPI 1841247145 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Pulmonary DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RP1001X
License✔ Licensed in CA · C36997
Definition
An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.
21840 NORMANDIE AVE, Torrance, CA 90502
Open in Google Maps ↗

Other Identifiers 5

Medicaid00C369970CA
OtherM050376CA · Group
OtherDA6447CA · Railroad Medicare
OtherCH1382CA · Railroad Medicare
OtherW14940CA · Group

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KATAYOUN K MOSTAFAIE M.D.
General Practice
21840 NORMANDIE AVE, STE. 700
TORRANCE, CA 90502
Los Angeles County (310) 222-5101
ANDREW G GIANOUKAKIS M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
21840 NORMANDIE AVE, STE. 700
TORRANCE, CA 90502
Los Angeles County (310) 222-5183
KATHY E SIETSEMA M.D.
Internal Medicine (Pulmonary Disease)
21840 NORMANDIE AVE
TORRANCE, CA 90502
Los Angeles County (310) 222-5101
MARK T. MUNEKATA M.D.
General Practice
21840 NORMANDIE AVE, STE. 700
TORRANCE, CA 90502
Los Angeles County (310) 222-5101
JOEL D. KOPPLE M.D.
Internal Medicine (Nephrology)
21840 NORMANDIE AVE, STE. 700
TORRANCE, CA 90502
Los Angeles County (310) 222-5101
NEDILJKA BULJUBASIC M.D.
Internal Medicine (Cardiovascular Disease)
21840 NORMANDIE AVE, STE. 700
TORRANCE, CA 90502
Los Angeles County (310) 222-5101
CATHERINE S MAO M.D.
Pediatrics (Pediatric Endocrinology)
21840 NORMANDIE AVE, STE. 1100
TORRANCE, CA 90502
Los Angeles County (310) 222-5133
RONALD SWERDLOFF M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
21840 NORMANDIE AVE, STE. 700
TORRANCE, CA 90502
Los Angeles County (310) 222-5101

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Mason's NPI number?

The NPI number for Gregory Mason is 1841247145. It was assigned to this individual provider in the NPPES registry on May 30, 2006.

Where is Gregory Mason located?

Gregory Mason practices at 21840 Normandie Ave Ste. 700, Torrance, CA 90502. The listed phone number is (310) 222-5101.

What is Gregory Mason's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.

When was this NPI record last updated?

The NPPES record for Gregory Mason was last updated on May 16, 2019. NPI Profile syncs with the weekly NPPES data releases published by CMS.