NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Freager Sinclair Williams, M.D.

Obstetrics & Gynecology Physician in Oakbrook Terrace, IL · enumerated 2007.

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

National Provider Identifier

1528103207

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Freager Sinclair Williams
Credential M.D.
Sex Male
Practice address 17w740 22nd St, Oakbrook Terrace, IL, 60181
Phone (630) 627-7162
Enumeration date Feb 21, 2007
Last updated in NPPES May 5, 2021

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 036-107930 (IL) 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

Where does Freager Williams practice?
The practice location on file with NPPES is in Oakbrook Terrace, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Freager Williams?
The National Provider Identifier (NPI) for Freager Williams is 1528103207, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-05.