Quick answers
- Where does Marissa Donnelly see patients?
- Medicare's clinician data lists 3 practice locations, including Liverpool, NY, Ithaca, NY and Elmira, NY. Call before your visit to confirm the address.
- What is Marissa Donnelly's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Marissa Donnelly accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa Donnelly accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Marissa Donnelly?
- (315) 291-0064, as listed in official Medicare / NPI Registry data.
- What is Marissa Donnelly's NPI number?
- 1144993619. 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 Donnelly is enrolled with Medicare (CMS data updated 2026-10-02).
- 7375 Oswego Rd, Suite 1Liverpool, NY 13090 (315) 291‑0064
- 740 S Main StIthaca, NY 14850 (607) 319‑4563
- 830 County Rd, Suite 64Elmira, NY 14903 (607) 846‑2030
Group practices
Medicare enrollment lists Marissa Donnelly as a member of this group (CMS data updated 2026-10-02).
- Wellnow Urgent Care, P.C.392 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Liverpool
Clinicians with the same Medicare primary specialty in Liverpool, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144993619 |
| 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 2026-10-02, retrieved 2026-10-29
- 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