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

Gretchen Kathleen Williams, D.O

Surgery Physician in Kankakee, IL · enumerated 2011.

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

National Provider Identifier

1659663581

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Registry record

Entity type Individual (Type 1)
Name Gretchen Kathleen Williams
Credential D.O
Sex Female
Practice address Kankakee, IL, 60901
Phone (815) 933-2221
Fax (815) 933-3975
Enumeration date May 11, 2011
Last updated in NPPES Feb 9, 2021

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

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 5101019120 (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

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 Gretchen Williams?
Gretchen Williams is registered in NPPES with the primary taxonomy of Surgery 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 2021-02-09.