Dianna Grantham, P.C.

Primary specialty

Mental Health CounselorTaxonomy code 101YM0800X

Legal business name

DIANNA GRANTHAM, P.C.

Practice address

501 S 44TH St W Apt 1325
Billings, MT 59106-3916

Phone

(406) 927-6119

NPI assigned

Mar 25, 2026

Organization subpart

No

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

Authorized official

Name

Dianna GranthamNPI 1639578974

Title

Provider

Phone

(406) 927-6119

Specialties & licenses 1

Addresses

Practitioners 1

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles.

• Dianna Grantham, LAC, LCPC

  • Professional Counselor
  • Billings, MT
  • NPI 1639578974
  NPD (past) Authorized official

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

{
    "created_epoch": "1774396800000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1774396800000",
    "number": "1659210714",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 30864",
            "city": "BILLINGS",
            "state": "MT",
            "postal_code": "591070864"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "501 S 44TH ST W APT 1325",
            "city": "BILLINGS",
            "state": "MT",
            "postal_code": "591063916",
            "telephone_number": "406-927-6119"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "DIANNA GRANTHAM, P.C.",
        "organizational_subpart": "NO",
        "enumeration_date": "2026-03-25",
        "last_updated": "2026-03-25",
        "certification_date": "2026-03-25",
        "status": "A",
        "authorized_official_last_name": "GRANTHAM",
        "authorized_official_first_name": "DIANNA",
        "authorized_official_title_or_position": "PROVIDER",
        "authorized_official_telephone_number": "406-927-6119"
    },
    "taxonomies": [
        {
            "code": "101YM0800X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Counselor, Mental Health",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Mental Health Counselor in Billings, MT
• Providers in Billings, MT by specialty
• Mental Health Counselor in Montana

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 25, 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.