Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Brian S Fassel, DO

Anesthesiology Physician in Denver, CO · enumerated 2005.

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

National Provider Identifier

1538145941

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Registry record

Entity type Individual (Type 1)

Name Brian S Fassel

Credential DO

Sex Male

Practice address 455 Sherman, Suite 510, Denver, CO, 80203

Phone (303) 377-6825

Fax (303) 780-0787

Enumeration date Dec 16, 2005

Last updated in NPPES Apr 18, 2013

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License 40574 (CO) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
0594259	Medicaid	IA	-
100426080A	Medicaid	KS	-
7713400	Medicaid	SD	-
117502500	Medicaid	WY	-
922585	Medicaid	AZ	-
54887348	Medicaid	CO	-
58020721	Medicaid	NM	-
3506685	Medicaid	MT	-
84113438513	Medicaid	NE	-

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Brian Fassel?

Brian Fassel is registered in NPPES with the primary taxonomy of Anesthesiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-04-18.