Regina Williams, PA-C
Physician Assistant · Mount Prospect, IL
Regina Williams, PA-C is a physician assistant with a practice address in Mount Prospect, Illinois, and NPI 1346228822, issued on Jan 5, 2006. Check the license (Illinois 085000591, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Regina Williams
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License numbers
- 085000591 IL
1026417 IL
Self-reported in NPPES; status is on the state search - Practice location
- 199 W Rand RD, Mount Prospect, IL 60056
- Phone
- (847) 618-5400
- Enumerated
- Jan 5, 2006
- Record last updated
- Apr 2, 2026
- Fax
- (847) 618-3709
- Medicare enrollment
- Enrolled (PECOS I20051220000876); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 199 W Rand RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Japhlet Leomil Aranas, M.D.Family Medicine Physician1992900609
- Kathryn Eubanks, MDInternal Medicine Physician1487638763
- Mary Farley, APRNNurse Practitioner1295334811
- Elizabeth Perez, M.D.Family Medicine Physician1316232796
Verify Regina Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 085000591Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average physician assistant in 2024
496 Medicare Part D claims for 393 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Doxycycline Hyclate103 claims
- Cephalexin39 claims
- Prednisone39 claims
- Nitrofurantoin Mono-Macro35 claims
- Methylprednisolone29 claims
- Azithromycin28 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.
The MIPS final score for 2023 (Medicare payment program): 89.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $19.02
1 payment: food and beverage; the largest payer was Abbott Laboratories. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Endeavor Health Medical GroupBuffalo Grove, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
10 physician assistant records list a practice address in Mount Prospect
They are 10 of the 431 NPPES records with a practice address in Mount Prospect, and 4,926 physician assistant records in Illinois.
All 10 in Mount Prospect → All 4,926 in Illinois → Every provider in Mount Prospect →
Other physician assistant records in Illinois
- Brooke Aarhus, PA-CPark Ridge, IL1760985469
- Sana Abbasi, PACarol Stream, IL1831803295
- Susan Abbinanti, PA-CElk Grove Village, IL1679647358
- Katheryn Abbott, PASchaumburg, IL1356842082
- Noor Abdelrahman, PA-CChicago, IL1851012413
- Amer Abdulghafoor, MSW, MS, PA-CChicago, IL1619401718
- Kazuko Abe, P.A.Chicago, IL1881840783
- Greta Abel, PA-CWheaton, IL1174844096
- Derrik AbellAnna, IL1821618471
- Jeanine Aberbook, PA-CChicago, IL1518664176
Common questions
What is Regina Williams, PA-C's NPI number?
Regina Williams, PA-C's National Provider Identifier (NPI) is 1346228822, issued on Jan 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Regina Williams, PA-C located?
The NPPES record lists a practice address at 199 W Rand RD, Mount Prospect, IL, 60056. Phone: (847) 618-5400. Providers update this record themselves, so call before visiting.
How can I verify Regina Williams, PA-C's license?
NPPES lists Illinois license number 085000591, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Regina Williams, PA-C prescribe under Medicare Part D?
In 2024, Regina Williams, PA-C had 496 Medicare Part D claims for 393 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Regina Williams, PA-C's MIPS final score?
The 2023 MIPS final score is 89.7 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.