Mavis Vaillancourt, LCSW, LAC
NPI 1134139058 · Clinical Social Worker · Libby, MT
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mavis Vaillancourt, LCSW, LAC is a Clinical Social Worker provider in Libby, MT (NPI 1134139058).
Provider details
- NPI number
- 1134139058
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW, LAC
- Sex
- Female
- Sole proprietor
- No
- License
- 912 (MT)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-09
- Last updated
- 2025-03-11
- Certified
- 2025-03-11
Frequently asked questions
- What is Mavis Vaillancourt's NPI number?
- Mavis Vaillancourt's National Provider Identifier (NPI) is 1134139058, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mavis Vaillancourt's specialty?
- Mavis Vaillancourt is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mavis Vaillancourt located?
- Mavis Vaillancourt's practice location on file with NPPES is 415 Louisiana Ave, Libby, MT 59923-2131.
- What is Mavis Vaillancourt's phone number?
- The practice phone number listed in the NPPES registry for Mavis Vaillancourt is (406) 546-8507.
- Does Mavis Vaillancourt accept Medicare?
- Mavis Vaillancourt is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mavis Vaillancourt's NPI active?
- Yes — Mavis Vaillancourt's NPI (1134139058) is active in the NPPES registry as of the last update on 2025-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.