Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marc Elliott Breen

Emergency Medicine Physician in Fort Collins, CO · enumerated 2007.

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

National Provider Identifier

1831399286

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Registry record

Entity type Individual (Type 1)

Name Marc Elliott Breen

Sex Male

Practice address 1024 S Lemay Ave, Fort Collins, CO, 80524

Phone (970) 495-7000

Fax (303) 306-7753

Enumeration date Jul 24, 2007

Last updated in NPPES Jul 14, 2015

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 036118981 (IL) Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 47871 (CO) Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License DR.0047871 (CO) Primary

Other identifiers

Identifier	Type	State	Issuer
01486365	Medicaid	CO	-

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 Marc Breen's NPI record?

Cross-check NPI 1831399286 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1831399286 active?

Yes, as of the latest NPPES snapshot, NPI 1831399286 is active (record last updated 2015-07-14).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-14.