Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Barker, D.O.

Family Medicine Physician in Chesterfield, MI · enumerated 2006.

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

National Provider Identifier

1275554073

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Registry record

Entity type Individual (Type 1)

Name Dr. William Barker

Credential D.O.

Sex Male

Practice address 30795 23 Mile Rd, Suite 205, Chesterfield, MI, 48047

Phone (586) 421-3150

Fax (586) 421-3151

Enumeration date Jul 21, 2006

Last updated in NPPES Mar 11, 2021

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 5101013935 (MI) 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
4320330	Medicaid	MI	-

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

Is NPI 1275554073 active?

Yes, as of the latest NPPES snapshot, NPI 1275554073 is active (record last updated 2021-03-11).

How do I verify William Barker's NPI record?

Cross-check NPI 1275554073 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-11.