Nathan Joseph Siesener, MD

Primary specialty

Diagnostic Radiology PhysicianTaxonomy code 2085R0202X

License

036164864 Issued in IL

Practice address

4500 Memorial Dr
Dept Radiology
Belleville, IL 62226-5360

Phone

(618) 257-5613

Fax

(314) 454-4641

NPI assigned

Mar 19, 2018

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in IL, GA, MO3 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 3

Specialty

Diagnostic Radiology

Education

University of Missouri, Columbia School of Medicine, 2018

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Clinical Radiologists SCGroup PAC ID 3476540873, 32 clinicians

Washington University Physicians in Illinois IncGroup PAC ID 4789945163, 168 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Memorial Hospital Hospital, Belleville, IL, CCN 140185
• Alton Memorial Hospital Hospital, Alton, IL, CCN 140002
• Barnes Jewish Hospital Hospital, Saint Louis, MO, CCN 260032
• Hopedale Hospital Hospital, Hopedale, IL, CCN 141330
• Pinckneyville Community Hospital Hospital, Pinckneyville, IL, CCN 141307

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.

• Clinical Radiologists, S.C.

  • Diagnostic Radiology Physician
  • Springfield, IL
  • NPI 1063469252

  GA, MO

  Medicare reassignment Care Compare group NPD
• Washington University Physicians in Illinois, Inc

  • Multi-Specialty Clinic/Center
  • O'Fallon, IL
  • NPI 1477076263
  Medicare reassignment Care Compare group NPD
• Emory Medical Care Foundation Inc

  • Internal Medicine Physician
  • Atlanta, GA
  • NPI 1063452381
  Medicare reassignment NPD
• Miracl, LLC

  • Multi-Specialty Clinic/Center
  • Rolla, MO
  • NPI 1205304300
  Medicare reassignment NPD
• The Emory Clinic Inc

  • Internal Medicine Physician
  • Atlanta, GA
  • NPI 1396798229

  Diagnostic Radiology

  Medicare reassignment NPD
• Washington University

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1962442475

  Diagnostic Radiology

  Medicare reassignment NPD
• Protestant Memorial Medical Center,Inc

  dba Memorial Hospital

  • General Acute Care Hospital
  • Belleville, IL
  • NPI 1477633766
  NPD
• Washington University Physicians in Illinois, Inc

  • Neurological Surgery Physician
  • Belleville, IL
  • NPI 1275289704
  NPD
• Emory Medical Care Foundation Inc

  • Physical Medicine & Rehabilitation Physician
  • Atlanta, GA
  • NPI 1063678563
  NPD
• Emory Medical Care Foundation Inc

  • Diagnostic Radiology Physician
  • Atlanta, GA
  • NPI 1225294739
  NPD
• Washington University Physicians in Illinois, Inc

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1457203135
  NPD
• Schuyler County Hospital District

  • Critical Access Hospital
  • Rushville, IL
  • NPI 1013969112
  NPD (past)

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

• Alton Memorial Hospital

  • Ambulance
  • Alton, IL
  • NPI 1063669117

  Hospital

  Care Compare affiliation
• Alton Memorial Hospital

  • General Acute Care Hospital
  • Alton, IL
  • NPI 1548278476
  Care Compare affiliation
• Hopedale Medical Foundation

  dba Hopedale Medical Complex

  • Critical Access Hospital
  • Hopedale, IL
  • NPI 1174569438
  Care Compare affiliation
• Pinckneyville Community Hospital

  • Critical Access Hospital
  • Pinckneyville, IL
  • NPI 1689646523
  Care Compare affiliation
• Protestant Memorial Medical Center, Inc.

  dba Memorial Hospital

  • General Acute Care Hospital
  • Belleville, IL
  • NPI 1982796181
  Care Compare affiliation
• Barnes Jewish Hospital

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1649299827
  Care Compare affiliation

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

{
    "created_epoch": "1521417600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761004800000",
    "number": "1295239804",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 7412011",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606742011",
            "telephone_number": "618-257-5613",
            "fax_number": "314-454-4641"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4500 MEMORIAL DR",
            "address_2": "DEPT RADIOLOGY",
            "city": "BELLEVILLE",
            "state": "IL",
            "postal_code": "622265360",
            "telephone_number": "618-257-5613",
            "fax_number": "314-454-4641"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIESENER",
        "first_name": "NATHAN",
        "middle_name": "JOSEPH",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-03-19",
        "last_updated": "2025-10-21",
        "certification_date": "2023-03-28",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "IL",
            "license": "036164864",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "200128296",
            "state": "MO"
        }
    ],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/",
            "affiliation": "Y",
            "affiliationName": "Washington University",
            "address_1": "4500 Memorial Dr",
            "address_2": "Dept Radiology",
            "city": "Belleville",
            "state": "IL",
            "country_code": "US",
            "postal_code": "622265360",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Grace Nicole Shutz
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• Craig A Sieron, OD
• Vivian Marie Sierra, PH.D. LMFT
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• Signal Hill School District 181
• Jessica Silvia, RN
• Kenneth Addison Silvia II, MD
• Kathrin Simac, COUNSELOR
• Gregory Joseph Simmons, M.D.

• Diagnostic Radiology Physician in Belleville, IL
• Providers in Belleville, IL by specialty
• Diagnostic Radiology Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 21, 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.