Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Big Sky Therapeutic Services, Pllc

Community/Behavioral Health Agency in Great Falls, MT · enumerated 2010 · authorized official Brett Gilleo, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1588966584

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Registry record

Entity type Organization (Type 2)

Legal business name Big Sky Therapeutic Services, Pllc

Other name <Unavail>

Practice address 1601 2nd Ave N Ste 700, Great Falls, MT, 59401

Phone (406) 205-0452

Fax (406) 545-2276

Enumeration date Nov 23, 2010

Last updated in NPPES Feb 25, 2023

Taxonomy & classification

101Y00000X Counselor Behavioral Health & Social Service Providers Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

101YP2500X Professional Counselor Behavioral Health & Social Service Providers Secondary

103K00000X Behavior Analyst Behavioral Health & Social Service Providers Secondary

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers Secondary

103TC2200X Clinical Child & Adolescent Psychologist Behavioral Health & Social Service Providers Secondary

104100000X Social Worker Behavioral Health & Social Service Providers Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers Secondary

106S00000X Behavior Technician Behavioral Health & Social Service Providers Secondary

251B00000X Case Management Agency Agencies · License LCPC 1009 (MT) Secondary

251C00000X Developmentally Disabled Services Day Training Agency Agencies Secondary

251K00000X Public Health or Welfare Agency Agencies Secondary

251S00000X Community/Behavioral Health Agency Agencies Primary

252Y00000X Early Intervention Provider Agency Agencies Secondary

253J00000X Foster Care Agency Agencies Secondary

Authorized official

Name Brett Gilleo

Title Owner

Phone (406) 240-2045

Other identifiers

Identifier	Type	State	Issuer
1588966584	Medicaid	MT	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where is Big Sky Therapeutic Services, Pllc located?

The practice location on file with NPPES is in Great Falls, MT.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-02-25. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-25.