Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Jeffrey J Warren, MD

Internal Medicine Physician in Thornton, CO · enumerated 2007.

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

National Provider Identifier

1316140627

Verified

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Registry record

Entity type Individual (Type 1)

Name Jeffrey J Warren

Credential MD

Sex Male

Practice address Thornton, CO, 80229

Phone (303) 286-5129

Enumeration date Jun 6, 2007

Last updated in NPPES Nov 29, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 125050254 (IL) Primary

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

Other identifiers

Identifier	Type	State	Issuer
CA4079	Other	IL	RR MEDICARE GROUP PTAN
P00617110	Other	IL	RR MEDICARE MEMBER PTAN
809840	Other	IL	MEDICARE GROUP #

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.

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Frequently asked questions

Where does Jeffrey Warren practice?

The practice location on file with NPPES is in Thornton, CO. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Jeffrey Warren?

The National Provider Identifier (NPI) for Jeffrey Warren is 1316140627, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-11-29.