Quick answers
- Which hospitals does Michael R. Cassidy work at?
- Medicare's official clinician data lists Michael R. Cassidy at 4 hospitals: Beth Israel Deaconess Hospital - Needham, Beth Israel Deaconess Medical Center, Boston Medical Center and Brigham and Women's Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael R. Cassidy see patients?
- Medicare's clinician data lists 2 practice locations, including Boston, MA. Call before your visit to confirm the address.
- What is Michael R. Cassidy's specialty?
- Medicare lists Surgical Oncology as the primary specialty, and also General Surgery.
- Does Michael R. Cassidy accept Medicare assignment?
- Yes. Medicare's clinician data says Michael R. Cassidy 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 Michael R. Cassidy?
- (617) 754-8612, as listed in official Medicare / NPI Registry data.
- What is Michael R. Cassidy's NPI number?
- 1114186905. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael R. Cassidy works
Medicare's Facility Affiliation Data lists Michael R. Cassidy at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Beth Israel Deaconess Hospital - NeedhamNeedham, MA · Acute Care Hospital · CCN 220083
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
- Boston Medical CenterBoston, MA · Acute Care Hospital · CCN 220031
- Brigham and Women's HospitalBoston, MA · Acute Care Hospital · CCN 220110
Practice locations
Addresses where Michael R. Cassidy is enrolled with Medicare (CMS data updated 2026-10-02).
- 330 Brookline AveBoston, MA 02215 (617) 754‑8612
- 450 Brookline AveBoston, MA 02215
Group practices
Medicare enrollment lists Michael R. Cassidy 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
- Dana-Farber Cancer Institute, Inc.684 clinicians in the group
Specialties
- Surgical Oncologyprimary
- General Surgeryalso
Other surgical oncologists in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Boston University School Of Medicine |
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1114186905 |
| 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