Quick answers
- Does Marina Gagnon-Diaz accept Medicare assignment?
- Yes. Medicare's clinician data says Marina Gagnon-Diaz 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 Marina Gagnon-Diaz's NPI number?
- 1295419117. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marina Gagnon-Diaz works
Medicare's Facility Affiliation Data lists Marina Gagnon-Diaz 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.
- Baystate Franklin Medical CenterGreenfield, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220016
- Baystate Medical CenterSpringfield, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220077
- Baystate Wing HospitalPalmer, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220030
Practice locations
Addresses where Marina Gagnon-Diaz is enrolled with Medicare (CMS data updated October 2, 2026).
- 164 High StGreenfield, MA 01301
- 280 Chestnut St, Suite 2Springfield, MA 01199
- 40 Wright StPalmer, MA 01069
- 759 Chestnut StSpringfield, MA 01199
Group practices
Medicare enrollment lists Marina Gagnon-Diaz as a member of this group (CMS data updated October 2, 2026).
- Baystate Medical Practices Inc1,369 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Greenfield
Clinicians with the same Medicare primary specialty in Greenfield, MA — not a recommendation.
Other clinicians in Baystate Medical Practices Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2025 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1295419117 |
| 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