Quick answers
- Which hospitals does Karen Terwilliger work at?
- Medicare's official clinician data lists Karen Terwilliger at 2 hospitals: William W Backus Hospital and Windham Community Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Karen Terwilliger see patients?
- Medicare's clinician data lists 2 practice locations, including Norwich, CT and Willimantic, CT. Call before your visit to confirm the address.
- What is Karen Terwilliger's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Karen Terwilliger accept Medicare assignment?
- Yes. Medicare's clinician data says Karen Terwilliger 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 Karen Terwilliger?
- (860) 889-8331, as listed in official Medicare / NPI Registry data.
- What is Karen Terwilliger's NPI number?
- 1245616705. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Karen Terwilliger works
Medicare's Facility Affiliation Data lists Karen Terwilliger at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- William W Backus HospitalNorwich, CT · Acute Care Hospital · CCN 070024
- Windham Community Memorial HospitalWillimantic, CT · Acute Care Hospital · CCN 070021
Practice locations
Addresses where Karen Terwilliger is enrolled with Medicare (CMS data updated 2026-10-02).
- 111 Salem TpkeNorwich, CT 06360 (860) 889‑8331
- 112 Mansfield AveWillimantic, CT 06226 (860) 456‑6752
Group practices
Medicare enrollment lists Karen Terwilliger as a member of these groups (CMS data updated 2026-10-02).
- The William W Backus Hospital249 clinicians in the group
- Windham Community Memorial Hospital Inc64 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Norwich
Clinicians with the same Medicare primary specialty in Norwich, CT — not a recommendation.
Clinician information
| Graduation year | 2015 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1245616705 |
| 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