Freager Sinclair Williams, M.D.
Obstetrics & Gynecology Physician · Oakbrook Terrace, IL
Freager Sinclair Williams, M.D. is an obstetrics & gynecology physician with a practice address in Oakbrook Terrace, Illinois, and NPI 1528103207, issued on Feb 21, 2007. Check the license (Illinois 036-107930, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Freager Sinclair Williams
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 036-107930 IL
Self-reported in NPPES; status is on the state search - Practice location
- 17W740 22ND St, Oakbrook Terrace, IL 60181
- Phone
- (630) 627-7162
- Enumerated
- Feb 21, 2007
- Record last updated
- May 5, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080712000136); accepts Medicare assignment
- Medical or professional school
- New York University Medical College - Nlg, 1996
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 2,062 in Illinois → Look up another NPI →
Also registered at 17W740 22ND St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jorge Asconape, MDNeurology Physician1245200609
- Sarah Wagner, M.D.Obstetrics & Gynecology Physician1558568998
Verify Freager Sinclair Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-107930Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
42 Medicare Part D claims for 15 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 33% of claims.
Most prescribed
- Medroxyprogesterone Acetate11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
One hospital affiliation
- Loyola University Medical CenterOakbrook Terrace, IL · Acute Care Hospitals2 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Freager Sinclair Williams among 2,062 obstetrics & gynecology physician records in Illinois
Freager Sinclair Williams, M.D. is one of 2,062 obstetrics & gynecology physician records with a practice address in Illinois. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 47% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated1996 · median 2006 among the 1,168 with a school on file
- Record last updated2021 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
4 obstetrics & gynecology physician records list a practice address in Oakbrook Terrace
They are 4 of the 282 NPPES records with a practice address in Oakbrook Terrace, and 2,062 obstetrics & gynecology physician records in Illinois.
All 2,062 in Illinois → Every provider in Oakbrook Terrace → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Kalee Ahlin, M.D.Oakbrook Terrace, IL 601811396859997
- Thomas Carver, MDOakbrook Terrace, IL 601811851474753
- Sarah Wagner, M.D.Oakbrook Terrace, IL 601811558568998
- Paul Dubrick, MDSycamore, IL 601781558345637
- Paula Hobson, M.D.Sycamore, IL 601781821215971
- Bryan Kruskol, DOSycamore, IL 601781497739569
- David Sui, M.D.Sycamore, IL 601781477565521
- Nichole Wiepert, M.D.Sycamore, IL 601781871735290
Common questions
What is Freager Sinclair Williams, M.D.'s NPI number?
Freager Sinclair Williams, M.D.'s National Provider Identifier (NPI) is 1528103207, issued on Feb 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Freager Sinclair Williams, M.D. located?
The NPPES record lists a practice address at 17W740 22ND St, Oakbrook Terrace, IL, 60181. Phone: (630) 627-7162. Providers update this record themselves, so call before visiting.
How can I verify Freager Sinclair Williams, M.D.'s license?
NPPES lists Illinois license number 036-107930, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Freager Sinclair Williams, M.D. prescribe under Medicare Part D?
In 2024, Freager Sinclair Williams, M.D. had 42 Medicare Part D claims for 15 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.