Marissa Harrington, LCSW
NPI 1831727999 · Clinical Social Worker · Hampton Bays, NY
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marissa Harrington, LCSW is a Clinical Social Worker provider in Hampton Bays, NY (NPI 1831727999).
Provider details
- NPI number
- 1831727999
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- No
- License
- 108856-01 (NY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
4 documented practice locations
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
Additional practice locations (3)
- 518 Montauk Hwy Ste 102Amagansett, NY 11930-2110Phone: (631) 267-5373Fax: (631) 267-5376
- 1444 5th AveBay Shore, NY 11706-4147Phone: (631) 647-3100
- 325 Meeting House LaneBldg 2 Suite 403Southampton, NY 11968Phone: (631) 283-2100Fax: (631) 283-5731
Registry dates
- Enumerated
- 2020-04-01
- Last updated
- 2025-01-23
- Certified
- 2025-01-23
Frequently asked questions
- What is Marissa Harrington's NPI number?
- Marissa Harrington's National Provider Identifier (NPI) is 1831727999, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Harrington's specialty?
- Marissa Harrington is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Marissa Harrington located?
- Marissa Harrington's practice location on file with NPPES is 182 West Montauk Hwy, Hampton Bays, NY 11946.
- What is Marissa Harrington's phone number?
- The practice phone number listed in the NPPES registry for Marissa Harrington is (631) 594-3910.
- Does Marissa Harrington accept Medicare?
- Marissa Harrington is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marissa Harrington's NPI active?
- Yes — Marissa Harrington's NPI (1831727999) is active in the NPPES registry as of the last update on 2025-01-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.