Quick answers
- Does Marissa Blaine accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa Blaine 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 Blaine's NPI number?
- 1568248854. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marissa Blaine works
Medicare's Facility Affiliation Data lists Marissa Blaine at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Mercy Medical CenterRockville Centre, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330259
Practice locations
Addresses where Marissa Blaine is enrolled with Medicare (CMS data updated October 2, 2026).
- 1000 Montauk HwyWest Islip, NY 11795 (516) 705‑2689
- 1000 N Village AveRockville Center, NY 11570 (516) 705‑3656
Group practices
Medicare enrollment lists Marissa Blaine as a member of this group (CMS data updated October 2, 2026).
- Samaritan Medical Services PC354 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in West Islip
Clinicians with the same Medicare primary specialty in West Islip, NY — not a recommendation.
Other clinicians in Samaritan Medical Services PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| School | State University Of New York At Stony Brook, School Of Medicine |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1568248854 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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