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

Robert 'Denny D Irwin, LAC

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1306935366

Robert 'Denny D Irwin, LAC is an Addiction (Substance Use Disorder) Counselor in Lewistown, Montana. Licensed in Montana. Registered with an NPI since 2006.

Licensed in
MT
In the registry since
2006
What do these letters mean?
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

212 Wendell Ave
Lewistown, MT 59457
Phone: (406) 538-7483
Fax: (406) 538-7491
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X · Licence 1158 (MT)

Record details

NPI number1306935366
Entity typeIndividual (Type 1)
GenderMale
Credentials LAC
Sole proprietorNo
NPI enumeratedOctober 11, 2006
Last updated in NPPESJuly 8, 2007
Mailing addressPo Box 44, Lewistown, MT 59457-0044

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