Mary Madison Callahan Dupont, DO

Primary specialty

Student in an Organized Health Care Education/Training ProgramTaxonomy code 390200000X

License

143159 Issued in MT

Practice address

123 S 27TH St
Billings, MT 59101-4227

Phone

(406) 247-3350

Fax

(406) 247-3389

NPI assigned

Apr 24, 2024

Last updated

Jul 20, 2026By the provider in NPPES

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Other names 1

• Mary Madison Callahan Former name

Medicare fee-for-service enrollment

Enrolled in MT

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

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

{
    "created_epoch": "1713916800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1784505600000",
    "number": "1306692074",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "123 S 27TH ST",
            "city": "BILLINGS",
            "state": "MT",
            "postal_code": "591014227",
            "telephone_number": "406-247-3350",
            "fax_number": "406-247-3389"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "123 S 27TH ST",
            "city": "BILLINGS",
            "state": "MT",
            "postal_code": "591014227",
            "telephone_number": "406-247-3350",
            "fax_number": "406-247-3389"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CALLAHAN DUPONT",
        "first_name": "MARY",
        "middle_name": "MADISON",
        "credential": "DO",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2024-04-24",
        "last_updated": "2026-07-20",
        "certification_date": "2026-07-20",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "MT",
            "license": "143159",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "MARY",
            "last_name": "CALLAHAN",
            "middle_name": "MADISON",
            "credential": "DO",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Terrence J Cahill, MD
• Destiny Caine
• Eliza Caldwell, FNP-C
• Nathan Wayne Caldwell, RPH
• Terry G Calkins, OT CHT
• Ryan Murphy Callahan
• Teresa L Callahan, RN
• Callais Counseling
• Jennifer Lynn Callais, LCPC
• Laura Anne Callan

• Student in an Organized Health Care Education/Training Program in Billings, MT
• Providers in Billings, MT by specialty
• Student in an Organized Health Care Education/Training Program in Montana

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 20, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.