Dennis E Hallahan, MD

Primary specialty

Radiation Oncology PhysicianTaxonomy code 2085R0001X

License

2009038834 Issued in MO

Practice address

4921 Parkview PL
Dept Radiation Oncology, LL
Saint Louis, MO 63110-1032

Phone

(314) 747-7236

Fax

(314) 362-8099

NPI assigned

Sep 30, 2006

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 MO, 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

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.

• Washington University Physicians in Illinois, Inc

  • Multi-Specialty Clinic/Center
  • O Fallon, IL
  • NPI 1477076263
  Medicare reassignment NPD
• Washington University

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1316987886
  Medicare reassignment
• Washington University Physicians in Illinois, Inc

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1174015515
  NPD
• Washington University Physicians in Illinois, Inc

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1457203135
  NPD
• Vanderbilt-Ingram Cancer Center Clarksville, LLC

  • Radiation Oncology Physician
  • Clarksville, TN
  • NPI 1295832525
  NPD (past)

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

{
    "created_epoch": "1159574400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1744848000000",
    "number": "1699867010",
    "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": "314-747-7236",
            "fax_number": "314-362-8099"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4921 PARKVIEW PL",
            "address_2": "DEPT RADIATION ONCOLOGY, LL",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631101032",
            "telephone_number": "314-747-7236",
            "fax_number": "314-362-8099"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HALLAHAN",
        "first_name": "DENNIS",
        "middle_name": "E",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-09-30",
        "last_updated": "2025-04-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "MO",
            "license": "2009038834",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "204528400",
            "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": "4921 Parkview Pl",
            "address_2": "Dept Radiation Oncology, LL",
            "city": "Saint Louis",
            "state": "MO",
            "country_code": "US",
            "postal_code": "631101032",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Susan Mary Hall, M.ED
• Tiffany Danielle Hall
• Trevor W Hall, PHARMD
• Yoshiko Hall, PSY.D.
• Alexandra Hallagan, MD
• Kaitlin Hallahan, DO
• Mary Grace Hallare, RD
• Anna M Halldorsdottir, M.D.
• Chase Hallemann, C-AA
• Kenneth A Haller, MD

• Radiation Oncology Physician in Saint Louis, MO
• Providers in Saint Louis, MO by specialty
• Radiation Oncology Physician in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 17, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.