NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Jeffrey R Williamson, DO

Family Medicine Physician in Rockford, MI · enumerated 2006.

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

National Provider Identifier

1881641165

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Registry record

Entity type Individual (Type 1)
Name Dr. Jeffrey R Williamson
Credential DO
Sex Male
Practice address Rockford, MI, 49341
Phone (616) 884-5191
Fax (616) 884-5192
Enumeration date May 30, 2006
Last updated in NPPES Jan 27, 2020

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License JW011762 (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
48103028 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.

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Frequently asked questions

Where does Jeffrey Williamson practice?
The practice location on file with NPPES is in Rockford, MI. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Jeffrey Williamson?
The National Provider Identifier (NPI) for Jeffrey Williamson is 1881641165, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-01-27.