Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael Willig, MD

Family Medicine Physician in Denver, CO · enumerated 2006.

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

National Provider Identifier

1639253156

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Registry record

Entity type Individual (Type 1)

Name Michael Willig

Credential MD

Sex Male

Practice address 3464 S Willow St, Suite 853, Denver, CO, 80231

Phone (303) 755-2900

Enumeration date Oct 24, 2006

Last updated in NPPES Aug 16, 2013

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 25546 (CO) 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
WI96971	Other	CO	BLUE SHIELD
01255462	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

What is the NPI number for Michael Willig?

The National Provider Identifier (NPI) for Michael Willig is 1639253156, a Type 1 (individual) record in the CMS NPPES registry.

Where does Michael Willig practice?

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

Other providers at this practice address

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Leonard Zemel Endocrinology, Diabetes & Metabolism Physician · Denver, CO NPI 1447256045 Daniel Horne Urology Physician · Denver, CO NPI 1831182351 Boulder Ekg Cardiovascular Disease Physician · Denver, CO NPI 1174581433 Susan Inns Physical Therapist · Denver, CO NPI 1366524860 Guinevere Sarnecki Occupational Therapist · Denver, CO NPI 1942383849 Carl Belle Physical Therapist · Denver, CO NPI 1326121625 William Bowman Dermatology Physician · Denver, CO NPI 1013076108 Daniel W. Horne M.D., Facs Urology Physician · Denver, CO NPI 1437456977

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-08-16.