Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

MS. Mavis H. Vaillancourt, LCSW, LAC

Individual provider Clinical Social Worker · NPI 1134139058

MS. Mavis H. Vaillancourt, LCSW, LAC is a Clinical Social Worker in Libby, Montana. Qualified in 2006, 20 years ago. Accepts Medicare assignment and offers telehealth. Licensed in Montana.

Years since qualifying
20
Licensed in
MT
In the registry since
2006
Specialties on file
2
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.
LAC — Licensed Associate Counselor
A counsellor practising under supervision toward full licensure. In some states the same letters mean Licensed Acupuncturist.

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Practice location Address checks out

415 Louisiana Ave
Libby, MT 59923-2131
Phone: (406) 546-8507
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 912 (MT)
Addiction (Substance Use Disorder) Counselor Taxonomy 101YA0400X · Licence 1140 (MT)

Record details

NPI number1134139058
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW , LAC
Sole proprietorNo
NPI enumeratedAugust 9, 2006
Last updated in NPPESMarch 11, 2025
Certification dateMarch 11, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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