Quick answers
- Which hospitals does Jason Greenbaum work at?
- Medicare's official clinician data lists Jason Greenbaum at 4 hospitals: Athol Memorial Hospital, Heywood Hospital -, Manchester Memorial Hospital and The Hospital of Central Connecticut. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jason Greenbaum see patients?
- Medicare's clinician data lists 2 practice locations, including Athol, MA and Gardner, MA. Call before your visit to confirm the address.
- What is Jason Greenbaum's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Jason Greenbaum accept Medicare assignment?
- Yes. Medicare's clinician data says Jason Greenbaum 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 Jason Greenbaum?
- (978) 249-3511, as listed in official Medicare / NPI Registry data.
- What is Jason Greenbaum's NPI number?
- 1649205493. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jason Greenbaum works
Medicare's Facility Affiliation Data lists Jason Greenbaum at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Athol Memorial HospitalAthol, MA · Critical Access Hospital · CCN 221303
- Heywood Hospital -Gardner, MA · Acute Care Hospital · CCN 220095
- Manchester Memorial HospitalManchester, CT · Acute Care Hospital · CCN 070027
- The Hospital of Central ConnecticutNew Britain, CT · Acute Care Hospital · CCN 070035
Practice locations
Addresses where Jason Greenbaum is enrolled with Medicare (CMS data updated 2026-10-02).
- 2033 Main StAthol, MA 01331 (978) 249‑3511
- 242 Green StGardner, MA 01440 (978) 632‑3420
Group practices
Medicare enrollment lists Jason Greenbaum as a member of these groups (CMS data updated 2026-10-02).
- Henry Heywood Memorial Hospital115 clinicians in the group
- Athol Memorial Hospital Incorporated74 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Athol
Clinicians with the same Medicare primary specialty in Athol, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649205493 |
| 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 2026-10-02, retrieved 2026-10-29
- 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