Quick answers
- Which hospitals does Sonja R. Schaffer work at?
- Medicare's official clinician data lists Sonja R. Schaffer at 2 hospitals: St Vincent Hospital and UMass Memorial Health - Harrington Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sonja R. Schaffer see patients?
- Medicare's clinician data lists 4 practice locations, including Worcester, MA, Auburn, MA and Charlton, MA. Call before your visit to confirm the address.
- What is Sonja R. Schaffer's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Sonja R. Schaffer accept Medicare assignment?
- Yes. Medicare's clinician data says Sonja R. Schaffer 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 Sonja R. Schaffer?
- (508) 334-1000, as listed in official Medicare / NPI Registry data.
- What is Sonja R. Schaffer's NPI number?
- 1336694439. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sonja R. Schaffer works
Medicare's Facility Affiliation Data lists Sonja R. Schaffer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Vincent HospitalWorcester, MA · Acute Care Hospital · CCN 220176
- UMass Memorial Health - Harrington HospitalSouthbridge, MA · Acute Care Hospital · CCN 220019
Practice locations
Addresses where Sonja R. Schaffer is enrolled with Medicare (CMS data updated 2026-10-02).
- 123 Summer StWorcester, MA 01608
- 55 Lake Ave NWorcester, MA 01655 (508) 334‑1000
- 813 Southbridge StAuburn, MA 01501 (508) 784‑1278
- 9 Trolley Crossing RdCharlton, MA 01507 (774) 475‑0509
Group practices
Medicare enrollment lists Sonja R. Schaffer as a member of these groups (CMS data updated 2026-10-02).
- UMass Memorial Medical Group Inc2,516 clinicians in the group
- Saint Vincent Physician Services Inc71 clinicians in the group
- Shane Speirs MD II PLLC17 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Worcester
Clinicians with the same Medicare primary specialty in Worcester, MA — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Medical school | University Of Massachusetts Medical School |
| Graduation year | 2016 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336694439 |
| 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