Quick answers
- Which hospitals does William Casey work at?
- Medicare's official clinician data lists William Casey at 5 hospitals: AdventHealth Sebring, Beth Israel Deaconess Medical Center, Mercy Medical Ctr, Southcoast Hospitals Group and Winchester Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Casey see patients?
- Medicare's clinician data lists 6 practice locations, including Fairhaven, MA, Springfield, MA and Boston, MA. Call before your visit to confirm the address.
- What is William Casey's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does William Casey accept Medicare assignment?
- Yes. Medicare's clinician data says William Casey 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 William Casey?
- (508) 973-3000, as listed in official Medicare / NPI Registry data.
- What is William Casey's NPI number?
- 1811933047. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Casey works
Medicare's Facility Affiliation Data lists William Casey at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- AdventHealth SebringSebring, FL · Acute Care Hospital · CCN 100109
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
- Mercy Medical CtrSpringfield, MA · Acute Care Hospital · CCN 220066
- Southcoast Hospitals GroupFall River, MA · Acute Care Hospital · CCN 220074
- Winchester HospitalWinchester, MA · Acute Care Hospital · CCN 220105
Practice locations
Addresses where William Casey is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 206 Mill RdFairhaven, MA 02719 (508) 973‑3000
- 271 Carew StSpringfield, MA 01104 (413) 748‑7370
- 330 Brookline AveBoston, MA 02215 (617) 754‑8612
- 506 Prospect StFall River, MA 02720 (508) 973‑7888
- 620 Washington St, Suite 1Winchester, MA 01890 (781) 983‑9088
Group practices
Medicare enrollment lists William Casey as a member of these groups (CMS data updated 2026-10-02).
- Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc1,740 clinicians in the group
- Southcoast Physicians Group Inc881 clinicians in the group
- Florida Hospital Medical Group Inc329 clinicians in the group
- Mercy Medical Group Inc16 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Massachusetts
Clinicians with the same Medicare primary specialty in Massachusetts — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811933047 |
| 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