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

Denis Patrick Callahan, MSW, LGSW

Individual provider Clinical Social Worker · NPI 1134364672

Denis Patrick Callahan, MSW, LGSW is a Clinical Social Worker in Nashua, New Hampshire. Licensed in New Hampshire. Registered with an NPI since 2008.

Licensed in
NH
In the registry since
2008
What do these letters mean?
MSW — Master of Social Work
The graduate degree in social work.

See every abbreviation used in this directory →

Practice location Address checks out

5 Pine Street Ext Unit 2S
Nashua, NH 03060-3250
Phone: (202) 903-6876
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 1608 (NH)

Record details

NPI number1134364672
Entity typeIndividual (Type 1)
GenderMale
Credentials MSW , LGSW
Sole proprietorNo
NPI enumeratedDecember 12, 2008
Last updated in NPPESFebruary 13, 2022
Certification dateFebruary 13, 2022

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