IndividualActive
Denis Callahan, MSW, LGSW
NPI 1134364672 · Clinical Social Worker · Nashua, NH
Denis Callahan, MSW, LGSW is a Clinical Social Worker provider in Nashua, NH (NPI 1134364672).
Provider details
- NPI number
- 1134364672
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- MSW, LGSW
- Sex
- Male
- Sole proprietor
- No
- License
- 1608 (NH)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(86/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
5 Pine Street Ext Unit 2s
Nashua, NH 03060-3250
Phone: (202) 903-6876
Street-level locationGet directions
Mailing address
5 Pine Street Ext Unit 2s
Nashua, NH 03060-3250
Registry dates
- Enumerated
- 2008-12-12
- Last updated
- 2022-02-13
- Certified
- 2022-02-13
Frequently asked questions
- What is Denis Callahan's NPI number?
- Denis Callahan's National Provider Identifier (NPI) is 1134364672, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Denis Callahan's specialty?
- Denis Callahan is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Denis Callahan located?
- Denis Callahan's practice location on file with NPPES is 5 Pine Street Ext Unit 2s, Nashua, NH 03060-3250.
- What is Denis Callahan's phone number?
- The practice phone number listed in the NPPES registry for Denis Callahan is (202) 903-6876.
- Is Denis Callahan's NPI active?
- Yes — Denis Callahan's NPI (1134364672) is active in the NPPES registry as of the last update on 2022-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.