Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jeffrey K Feinfield, M.D.

Specialist in Thousand Oaks, CA · enumerated 2006.

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

National Provider Identifier

1740372028

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Registry record

Entity type Individual (Type 1)

Name Jeffrey K Feinfield

Credential M.D.

Sex Male

Practice address 555 Marin St, Ste 100, Thousand Oaks, CA, 91360

Phone (805) 494-4797

Fax (805) 494-4810

Enumeration date Sep 28, 2006

Last updated in NPPES Apr 27, 2017

Taxonomy & licenses

174400000X Specialist Other Service Providers · License A71991 (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 Jeffrey Feinfield's NPI record?

Cross-check NPI 1740372028 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1740372028 active?

Yes, as of the latest NPPES snapshot, NPI 1740372028 is active (record last updated 2017-04-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-04-27.