Michael J Hennessy, MD

Primary specialty

Orthopaedic Surgery PhysicianTaxonomy code 207X00000X

License

7944 Issued in MT

Practice address

3000 16TH Ave S
Great Falls, MT 59405

Phone

(406) 454-2171

Fax

(406) 771-3021

NPI assigned

Aug 9, 2005

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

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

HHS exclusion list flag

Flagged The directory lists this NPI on an HHS exclusion list. The OIG exclusions file (LEIE) holds no record for this NPI, and the directory does not say which list the flag comes from. How exclusions are shown Confirm with the OIG exclusions search.

Credentials

Doctor of Medicine

State licenses

Practice roles

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.

• Central Montana Medical Facilities, Inc

  • Critical Access Hospital
  • Lewistown, MT
  • NPI 1790798387
  NPD (past)
• Central Montana Medical Facilities, Inc.

  • Family Medicine Physician
  • Lewistown, MT
  • NPI 1497868814

  Orthopaedic Surgery

  NPD (past)

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

{
    "created_epoch": "1123545600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1124029616",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1400 29TH ST S",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "594055353",
            "telephone_number": "406-454-2171",
            "fax_number": "406-771-3021"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3000 16TH AVE S",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "59405",
            "telephone_number": "406-454-2171",
            "fax_number": "406-771-3021"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HENNESSY",
        "first_name": "MICHAEL",
        "middle_name": "J",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-08-09",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207X00000X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery",
            "state": "MT",
            "license": "7944",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0015587",
            "state": "MT"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Michael P Hemmy, BHPSS
• Gaylord E Henderson
• Karen Rachel Hendricks, LCPC
• Mary Ellen Hendrickson, LMT
• Dillon Michael Hennessey
• William E Henning, DO
• Jimmie Ann Henry
• Amanda Anne Henzel, MD
• Genevieve Hepworth, LCPC
• Michael E. Herbert, MD

• Orthopaedic Surgery Physician in Great Falls, MT
• Providers in Great Falls, MT by specialty
• Orthopaedic Surgery Physician in Montana

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.