Marian Hallowell, LICSW
NPI 1396236600 · Clinical Social Worker · Portsmouth, NH
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marian Hallowell, LICSW is a Clinical Social Worker provider in Portsmouth, NH (NPI 1396236600).
Provider details
- NPI number
- 1396236600
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LICSW
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
- Social Worker104100000X
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
8 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
Mailing address
Registry dates
- Enumerated
- 2018-05-22
- Last updated
- 2022-09-15
- Certified
- 2022-09-15
Frequently asked questions
- What is Marian Hallowell's NPI number?
- Marian Hallowell's National Provider Identifier (NPI) is 1396236600, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marian Hallowell's specialty?
- Marian Hallowell is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Marian Hallowell located?
- Marian Hallowell's practice location on file with NPPES is 8 Greenleaf Woods Dr Ste 100, Portsmouth, NH 03801-5436.
- What is Marian Hallowell's phone number?
- The practice phone number listed in the NPPES registry for Marian Hallowell is (603) 422-8202.
- Does Marian Hallowell accept Medicare?
- Marian Hallowell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marian Hallowell's NPI active?
- Yes — Marian Hallowell's NPI (1396236600) is active in the NPPES registry as of the last update on 2022-09-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.