Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mr. Pieter Hartwig Sween, LCSW

Individual provider Clinical Social Worker · NPI 1780385526

Mr. Pieter Hartwig Sween, LCSW is a Clinical Social Worker in Missoula, Montana. Practices as a sole proprietor. Licensed in Montana.

Licensed in
MT
In the registry since
2023
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

840 Rollins St Apt C
Missoula, MT 59801-3709
Phone: (406) 544-7684
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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 BBH-LCSW-LIC-43180 (MT)

Record details

NPI number1780385526
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorYes
NPI enumeratedMarch 16, 2023
Last updated in NPPESMarch 16, 2023
Certification dateMarch 16, 2023

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