DR. FREAGER SINCLAIR WILLIAMS M.D.
NPI 1528103207
Obstetrics & Gynecology in Oakbrook Terrace, IL
About Dr. Freager Sinclair Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. FREAGER SINCLAIR WILLIAMS M.D. (NPI 1528103207) is an individual obstetrics & gynecology provider in Oakbrook Terrace, Illinois, licensed in Illinois (036-107930) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with Loyola Gottlieb Memorial Hospital, and is a graduate of New York University Medical College - Nlg (1996).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Freager Sinclair Williams M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Freager Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Maywood, IL 60153
- Reassigned Medicare billing, Illinois enrollment
- 1,138 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Loyola Gottlieb Memorial Hospital
Acute Care Hospitals · Melrose Park, ILLoyola University Medical Center
Acute Care Hospitals · Maywood, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60181 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OAKBROOK TERRACE, IL 60181
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Freager Williams's NPI number?
The NPI number for Freager Williams is 1528103207. It was assigned to this individual provider in the NPPES registry on February 21, 2007.
Where is Freager Williams located?
Freager Williams practices at 17w740 22nd St, Oakbrook Terrace, IL 60181. The listed phone number is (630) 627-7162.
What is Freager Williams's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Freager Williams enrolled in Medicare?
Yes. Freager Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Freager Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Freager Williams reassigns Medicare benefits to Loyola University Medical Center (Maywood, IL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Freager Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Freager Williams accept?
Health plans from Oscar Health list Freager Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Freager Williams affiliated with any hospitals?
According to CMS data, Freager Williams is affiliated with Loyola Gottlieb Memorial Hospital and Loyola University Medical Center.
When was this NPI record last updated?
The NPPES record for Freager Williams was last updated on May 5, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Freager Sinclair Williams, M.D. · NPI 1528103207
Obstetrics & Gynecology physician in Oakbrook Terrace, Illinois. Individual provider, active in the CMS NPPES registry since February 21, 2007.
## Identity
- **NPI:** 1528103207 (Entity type: Individual)
- **Enumerated:** February 21, 2007
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 036-107930 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 17W740 22ND ST, Oakbrook Terrace, IL 60181-4402
- **Phone:** (630) 627-7162
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Loyola University Medical Center (NPI 1336159961, Maywood, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York University Medical College - Nlg, class of 1996
## Record status
- **NPPES last updated:** May 5, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1528103207) · Data from the CMS NPPES public registry.