IndividualActive
Gillian O'Brien
NPI 1841177417 · Mental Health Counselor · Medford, MA
Gillian O'Brien is a Mental Health Counselor provider in Medford, MA (NPI 1841177417).
Provider details
- NPI number
- 1841177417
- 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
Basic profile(48/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in 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
42 High St
Medford, MA 02155-3863
Phone: (781) 350-4430
Street-level locationGet directions
Mailing address
5 Seneca Rd
Winchester, MA 01890-3443
Registry dates
- Enumerated
- 2025-08-18
- Last updated
- 2025-08-18
- Certified
- 2025-08-15
Frequently asked questions
- What is Gillian O'Brien's NPI number?
- Gillian O'Brien's National Provider Identifier (NPI) is 1841177417, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gillian O'Brien's specialty?
- Gillian O'Brien is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is Gillian O'Brien located?
- Gillian O'Brien's practice location on file with NPPES is 42 High St, Medford, MA 02155-3863.
- What is Gillian O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Gillian O'Brien is (781) 350-4430.
- Is Gillian O'Brien's NPI active?
- Yes — Gillian O'Brien's NPI (1841177417) is active in the NPPES registry as of the last update on 2025-08-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.