Cecilia Cassidy Lenahan, LCPC, LAC

Primary specialty

Addiction (Substance Use Disorder) CounselorTaxonomy code 101YA0400X

License

BBH-LAC-LIC-4258 Issued in MT

Practice address

510 1St Ave N
Great Falls, MT 59401-2592

Phone

(406) 454-6973

Fax

(406) 791-9277

NPI assigned

Apr 7, 2015

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in MT

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: No
• Power mobility devices: No
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Mental Health Counselor

Education

Other, 2007

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Community Health Care Center IncorporatedGroup PAC ID 7214272848, 17 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Community Health Care Center Incorporated

  dba Alluvion Health

  • Federally Qualified Health Center (FQHC)
  • Great Falls, MT
  • NPI 1902948946
  Medicare reassignment Care Compare group NPD
• County of Cascade

  dba City County Health Department

  • Family Nurse Practitioner
  • Great Falls, MT
  • NPI 1972645901
  NPD (past)

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

{
    "created_epoch": "1428364800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1776038400000",
    "number": "1659767580",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "601 1ST AVE N",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "594012510",
            "telephone_number": "406-454-6973",
            "fax_number": "406-791-9277"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "510 1ST AVE N",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "594012592",
            "telephone_number": "406-454-6973",
            "fax_number": "406-791-9277"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "3911 Central Ave",
            "address_purpose": "LOCATION",
            "city": "Great Falls",
            "state": "MT",
            "postal_code": "594051637",
            "country_code": "US",
            "telephone_number": "406-454-6973",
            "fax_number": "406-791-9277",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "2400 Central Ave Rm 118",
            "address_purpose": "LOCATION",
            "city": "Great Falls",
            "state": "MT",
            "postal_code": "594013915",
            "country_code": "US",
            "telephone_number": "406-454-6973",
            "fax_number": "406-791-9277",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "LENAHAN",
        "first_name": "CECILIA",
        "middle_name": "CASSIDY",
        "name_prefix": "Ms.",
        "credential": "LCPC, LAC",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2015-04-07",
        "last_updated": "2026-04-13",
        "certification_date": "2026-04-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YP2500X",
            "taxonomy_group": "",
            "desc": "Counselor, Professional",
            "state": "MT",
            "license": "BBH-LCPC-LIC-81696",
            "primary": false
        },
        {
            "code": "101YA0400X",
            "taxonomy_group": "",
            "desc": "Counselor, Addiction (Substance Use Disorder)",
            "state": "MT",
            "license": "BBH-LAC-LIC-4258",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• James B Legan, MD
• Laura Marie Legan, LCPC
• Daniel Leishman, BC-HIS
• Jordan Lejeune, M.D.
• Sami Jo Lemons-Velez
• Tony J Lenz, MD
• Jamie L Leonard, PHARMD
• Elizabeth Anne Leraas, RPH
• Tim Levandowski, RPH
• Levi C Maltby DMD P.C.

• Addiction (Substance Use Disorder) Counselor in Great Falls, MT
• Providers in Great Falls, MT by specialty
• Addiction (Substance Use Disorder) Counselor in Montana

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 13, 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.
• 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.