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

MS. Diana Longdon, LCSW

Individual provider Clinical Social Worker · NPI 1598861353

MS. Diana Longdon, LCSW is a Clinical Social Worker in Helena, Montana. Practices as a sole proprietor. Licensed in Montana.

Licensed in
MT
In the registry since
2006
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

535 Saddle Dr
Helena, MT 59601-5634
Phone: (406) 449-3115
Fax: (406) 449-8828
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 121 (MT)

Record details

NPI number1598861353
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorYes
NPI enumeratedSeptember 16, 2006
Last updated in NPPESJuly 8, 2007

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