Robert R McWilliams, M.D.

Primary specialty

Medical Oncology PhysicianTaxonomy code 207RX0202X

License

036131628 Issued in IL

Practice address

530 NE Glen Oak Ave
Peoria, IL 61637-0001

Phone

(309) 655-2000

NPI assigned

Jan 12, 2006

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 4

Addresses

Medicare fee-for-service enrollment

Enrolled in MN, IL2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Medical OncologyAlso: Hematology/Oncology

Education

George Washington University School of Medicine, 1997

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Mayo ClinicGroup PAC ID 6507778255, 4,829 clinicians

Osf Multi-Specialty GroupGroup PAC ID 3678889789, 2,123 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Saint Francis Medical Center Hospital, Peoria, IL, CCN 140067
• Mayo Clinic Hospital Rochester Hospital, Rochester, MN, CCN 240010
• St Mary Medical Center Hospital, Galesburg, IL, CCN 140064

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: rmcwilliams34052@ehrdirect.mayoclinicmsg.org

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Osf Multi-Specialty Group

  • Internal Medicine Physician
  • Peoria, IL
  • NPI 1922445527
  Medicare reassignment Care Compare group NPD
• Mayo Clinic

  • Multi-Specialty Clinic/Center
  • Rochester, MN
  • NPI 1922074434
  Medicare reassignment Care Compare group NPD
• Central PA Pharmacy LLC.

  • Community/Retail Pharmacy
  • Patton, PA
  • NPI 1578541413
  NPD
• Mayo Clinic

  • Clinical Medical Laboratory
  • Rochester, MN
  • NPI 1083249577
  NPD
• Mayo Clinic

  • Infectious Disease Physician
  • Rochester, MN
  • NPI 1114343860
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• St Mary Medical Center

  • General Acute Care Hospital
  • Galesburg, IL
  • NPI 1164485363
  Care Compare affiliation
• Mayo Clinic Hospital-Rochester

  • General Acute Care Hospital
  • Rochester, MN
  • NPI 1841266194
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1137024000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771977600000",
    "number": "1487633962",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "30791 HIGH RD",
            "city": "FOUNTAIN",
            "state": "MN",
            "postal_code": "559355147",
            "telephone_number": "507-358-5982"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "530 NE GLEN OAK AVE",
            "city": "PEORIA",
            "state": "IL",
            "postal_code": "616370001",
            "telephone_number": "309-655-2000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "200 1st St SW",
            "address_purpose": "LOCATION",
            "city": "Rochester",
            "state": "MN",
            "postal_code": "559050001",
            "country_code": "US",
            "telephone_number": "507-284-2511",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MCWILLIAMS",
        "first_name": "ROBERT",
        "middle_name": "R",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-01-12",
        "last_updated": "2026-02-25",
        "certification_date": "2026-02-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036131628",
            "primary": false
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "MN",
            "license": "44014",
            "primary": false
        },
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "MN",
            "license": "44014",
            "primary": false
        },
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "IL",
            "license": "036131628",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Case McNally
• Leanne J McNett, LCSW
• R Parker McRae, M.D.
• Gerald McShane
• Patrick McShane
• Joy L Meachum, LCSW
• James A Meagher, D.D.S
• Michael Patrick Meaney, APRN, CNP
• Jeffrey Allen Medernach, RPH
• Medexpress Urgent Care Illinois, P.C.

• Medical Oncology Physician in Peoria, IL
• Providers in Peoria, IL by specialty
• Medical Oncology Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 25, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.