Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William J Milliken, MD

Preventive Medicine/Occupational Environmental Medicine Physician in Windsor, CO · enumerated 2005.

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

National Provider Identifier

1578552360

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Registry record

Entity type Individual (Type 1)

Name Dr. William J Milliken

Credential MD

Sex Male

Practice address 8010 S County Road 5, Centerstone Suite 101, Windsor, CO, 80528

Phone (970) 377-1300

Fax (970) 377-1314

Enumeration date Oct 14, 2005

Last updated in NPPES Oct 9, 2009

Taxonomy & licenses

2083P0500X Preventive Medicine/Occupational Environmental Medicine Physician Allopathic & Osteopathic Physicians · License 39695 (CO) Primary

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

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 William Milliken?

The National Provider Identifier (NPI) for William Milliken is 1578552360, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Milliken practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-09.