IndividualActive
Gwendolyn Callahan
NPI 1205095429 · Mental Health Counselor · Derry, NH
Gwendolyn Callahan is a Mental Health Counselor provider in Derry, NH (NPI 1205095429).
Provider details
- NPI number
- 1205095429
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(81/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
83% 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
10 Tsienneto Rd
Derry, NH 03038-1505
Phone: (603) 434-1577
Fax: (603) 434-3101
Street-level locationGet directions
Mailing address
10 Tsienneto Rd
Derry, NH 03038-1505
Registry dates
- Enumerated
- 2008-06-03
- Last updated
- 2008-06-03
Frequently asked questions
- What is Gwendolyn Callahan's NPI number?
- Gwendolyn Callahan's National Provider Identifier (NPI) is 1205095429, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gwendolyn Callahan's specialty?
- Gwendolyn Callahan is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is Gwendolyn Callahan located?
- Gwendolyn Callahan's practice location on file with NPPES is 10 Tsienneto Rd, Derry, NH 03038-1505.
- What is Gwendolyn Callahan's phone number?
- The practice phone number listed in the NPPES registry for Gwendolyn Callahan is (603) 434-1577.
- Is Gwendolyn Callahan's NPI active?
- Yes — Gwendolyn Callahan's NPI (1205095429) is active in the NPPES registry as of the last update on 2008-06-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.