Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Robert R Mcwilliams, M.D.

Medical Oncology Physician in Peoria, IL · enumerated 2006.

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

National Provider Identifier

1487633962

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Registry record

Entity type Individual (Type 1)

Name Robert R Mcwilliams

Credential M.D.

Sex Male

Practice address 530 Ne Glen Oak Ave, Peoria, IL, 61637

Phone (309) 655-2000

Enumeration date Jan 12, 2006

Last updated in NPPES Feb 25, 2026

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 036131628 (IL) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 44014 (MN) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 44014 (MN) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 036131628 (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.

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Frequently asked questions

What specialty is Robert Mcwilliams?

Robert Mcwilliams is registered in NPPES with the primary taxonomy of Medical Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Jack Gibson Obstetrics & Gynecology Physician · Peoria, IL NPI 1346235777 Cara Phillips Pharmacist · Peoria, IL NPI 1801881446 Mary Ross Pediatric Hematology & Oncology Physician · Peoria, IL NPI 1841287588 Samir Saxena Internal Medicine Physician · Peoria, IL NPI 1902883648 Clarissa Rhode Diagnostic Radiology Physician · Peoria, IL NPI 1326026030 University of Illinois Internal Medicine Physician · Peoria, IL NPI 1255301909 University of Illinois Pediatric Critical Care Medicine Physician · Peoria, IL NPI 1205807187 William Dunn Radiation Oncology Physician · Peoria, IL NPI 1669447504

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-25.