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

Stephen L Warren

Anatomic Pathology Physician in Fort Collins, CO · enumerated 2019.

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

National Provider Identifier

1902449804

Verified

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Registry record

Entity type Individual (Type 1)

Name Stephen L Warren

Sex Male

Practice address Fort Collins, CO, 80526

Phone (970) 556-0562

Enumeration date Oct 23, 2019

Last updated in NPPES Oct 23, 2019

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

Taxonomy & licenses

207ZP0101X Anatomic Pathology Physician Allopathic & Osteopathic Physicians · License 0036676 (CO) Primary

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

What is the NPI number for Stephen Warren?

The National Provider Identifier (NPI) for Stephen Warren is 1902449804, a Type 1 (individual) record in the CMS NPPES registry.

Where does Stephen Warren practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-10-23.