Robert R. McWilliams, M.D.
Medical Oncology Physician · Peoria, IL
Robert R. McWilliams, M.D. is a medical oncology physician with a practice address in Peoria, Illinois, and NPI 1487633962, issued on Jan 12, 2006. Check the license (Illinois 036131628, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Robert R. McWilliams
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License numbers
- 036131628 IL
44014 MN
Self-reported in NPPES; status is on the state search - Practice location
- 530 NE Glen Oak Ave, Peoria, IL 61637
- Phone
- (309) 655-2000
- Enumerated
- Jan 12, 2006
- Record last updated
- Feb 25, 2026
- Medicare enrollment
- Enrolled (PECOS I20050124001040); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 182 in Illinois → Look up another NPI →
Also registered at 530 NE Glen Oak Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Motaz Abas, MDInternal Medicine Physician1215510201
- Mohammed Abdulaaima, MDInternal Medicine Physician1861952707
- Makram Abou Ghaida, MDStudent in an Organized Health Care Education/Training Program1659119253
- Bassel Abouzeid, MDObstetrics & Gynecology Physician1376160846
- Susan Abraham, M.D.Internal Medicine Physician1598926818
- Angela AdamsOccupational Therapist1124564802
Verify Robert R. McWilliams 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 036131628Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average medical oncology physician in 2024
294 Medicare Part D claims for 85 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims.
Most prescribed
- Dexamethasone41 claims
- Ondansetron Hcl27 claims
- Creon20 claims
- Olanzapine20 claims
- Prochlorperazine Maleate16 claims
- Eliquis15 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.
Bills Medicare through 2 group practices
- Mayo ClinicRochester, MN
- Osf Multi-Specialty GroupPeoria, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert R. McWilliams among 182 medical oncology physician records in Illinois
Robert R. McWilliams, M.D. is one of 182 medical oncology physician records with a practice address in Illinois. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 43% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1997 · median 2000 among the 132 with a school on file
- Record last updated2026 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Illinois
There are 182 medical oncology physician records in Illinois.
All 182 in Illinois → Every provider in Peoria → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Peter Egwom, MDPeoria, IL 616031649898784
- John Migas, M.D.Normal, IL 617611629076971
- Bhanu Vakkalanka, M.D.Normal, IL 617611578766796
- Patricia Johnson, MDUrbana, IL 618011467477869
- Ronnie Luyun, MDUrbana, IL 618011346291960
- Kendrith Rowland, MDUrbana, IL 618011407955206
- Tanmay Sahai, M.D.Urbana, IL 618011104265347
- Vamsi Vasireddy, DOUrbana, IL 618011801802996
Common questions
What is Robert R. McWilliams, M.D.'s NPI number?
Robert R. McWilliams, M.D.'s National Provider Identifier (NPI) is 1487633962, issued on Jan 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert R. McWilliams, M.D. located?
The NPPES record lists a practice address at 530 NE Glen Oak Ave, Peoria, IL, 61637. Phone: (309) 655-2000. Providers update this record themselves, so call before visiting.
How can I verify Robert R. McWilliams, M.D.'s license?
NPPES lists Illinois license number 036131628, 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 Robert R. McWilliams, M.D. prescribe under Medicare Part D?
In 2024, Robert R. McWilliams, M.D. had 294 Medicare Part D claims for 85 beneficiaries; the average among medical oncology physician prescribers was 703. 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.