Quick answers
- Does Marissa Harrington accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa Harrington accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Marissa Harrington's NPI number?
- 1831727999. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Marissa Harrington is enrolled with Medicare (CMS data updated October 2, 2026).
- 182 W Montauk Hwy, Suite BHampton Bays, NY 11946 (631) 594‑3910
- 325 Meeting House Ln, Suite 302Southampton, NY 11968 (631) 283‑8008
Group practices
Medicare enrollment lists Marissa Harrington as a member of this group (CMS data updated October 2, 2026).
- Meeting House Lane Medical Practice PC124 clinicians in the group
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Hampton Bays
Clinicians with the same Medicare primary specialty in Hampton Bays, NY — not a recommendation.
Other clinicians in Meeting House Lane Medical Practice PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1831727999 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians