Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Kathryn Ann Mason, MD

Occupational Medicine Physician in Bakersfield, CA · enumerated 2006 · practices at Southern California Permanente Medical Group.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1679640502

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Registry record

Entity type Individual (Type 1)

Name Kathryn Ann Mason

Credential MD

Sex Female

Practice address 3733 San Dimas St, Bakersfield, CA, 93301

Phone (800) 353-5400

Enumeration date Nov 29, 2006

Last updated in NPPES Sep 23, 2008

Taxonomy & licenses

2083X0100X Occupational Medicine Physician Allopathic & Osteopathic Physicians · License A61771 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Kathryn Mason's NPI record?

Cross-check NPI 1679640502 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1679640502 active?

Yes, as of the latest NPPES snapshot, NPI 1679640502 is active (record last updated 2008-09-23).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-23.