Quick answers
- Does Rosemary J. Larson accept Medicare assignment?
- Yes. Medicare's clinician data says Rosemary J. Larson 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 Rosemary J. Larson's NPI number?
- 1851286363. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Rosemary J. Larson works
Medicare's Facility Affiliation Data lists Rosemary J. Larson 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 Medical CenterSpringfield, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220077
- Mercy Medical CenterSpringfield, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220066
- The Cooley Dickinson Hospital IncNorthampton, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220015
Practice locations
Addresses where Rosemary J. Larson is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 Wason Ave, Suite 100Springfield, MA 01107 (413) 233‑2052
Group practices
Medicare enrollment lists Rosemary J. Larson as a member of this group (CMS data updated October 2, 2026).
- Ear Nose and Throat Surgeons of Western New England LLC16 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Springfield
Clinicians with the same Medicare primary specialty in Springfield, MA — not a recommendation.
Other clinicians in Ear Nose and Throat Surgeons of Western New England LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2025 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851286363 |
| 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