Willis John Rieker Jr., M.D.

Primary specialty

Cytopathology PhysicianTaxonomy code 207ZC0500X

License

35629-020 Issued in WI

Practice address

1969 W Hart Rd
Beloit, WI 53511-2230

Phone

(608) 364-5131

Fax

(608) 364-3185

NPI assigned

Feb 7, 2007

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Enrolled in WI

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 1

Specialty

Pathology

Education

Loyola University of Chicago, Stritch School of Medicine, 1984

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Hart Road Pathology, SCGroup PAC ID 7113986100, 3 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Beloit Health System Hospital, Beloit, WI, CCN 520100

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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.

• Hart Road Pathology SC

  • Clinical Pathology Physician
  • Beloit, WI
  • NPI 1740459072
  Medicare reassignment Care Compare group NPD

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

• Beloit Health System Inc

  dba Beloit Memorial Hospital

  • General Acute Care Hospital
  • Beloit, WI
  • NPI 1982780094
  Care Compare affiliation

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

{
    "created_epoch": "1170806400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757548800000",
    "number": "1689714834",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1969 W HART RD",
            "city": "BELOIT",
            "state": "WI",
            "postal_code": "535112230",
            "telephone_number": "608-364-5131",
            "fax_number": "608-364-3185"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1969 W HART RD",
            "city": "BELOIT",
            "state": "WI",
            "postal_code": "535112230",
            "telephone_number": "608-364-5131",
            "fax_number": "608-364-3185"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "RIEKER",
        "first_name": "WILLIS",
        "middle_name": "JOHN",
        "name_suffix": "Jr.",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2007-02-07",
        "last_updated": "2025-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207ZC0500X",
            "taxonomy_group": "",
            "desc": "Pathology, Cytopathology",
            "state": "WI",
            "license": "35629-020",
            "primary": true
        },
        {
            "code": "207ZP0102X",
            "taxonomy_group": "",
            "desc": "Pathology, Anatomic Pathology & Clinical Pathology",
            "state": "WI",
            "license": "35629-020",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "32846400",
            "state": "WI"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Samantha Christine Rhoades, LCPC
• Nancy Richardson, MSE, LPC, CSAC
• Lauren Rick
• Ride the Wave Counseling LLC
• Paula B Riebe, PA-C
• Cynthia M Riffle, DDS
• Ellen Mary Alice Rippl, CD
• Donna Risch, RN
• Brian D. Ritcher, M.D.
• Riverwind Therapeutics, LLC

• Cytopathology Physician in Beloit, WI
• Providers in Beloit, WI by specialty
• Cytopathology Physician in Wisconsin

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; 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.