Quick answers
- Which hospitals does Antonia E. Stephen work at?
- Medicare's official clinician data lists Antonia E. Stephen at 3 hospitals: Massachusetts Eye and Ear Infirmary -, Massachusetts General Hospital and Newton-Wellesley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Antonia E. Stephen see patients?
- Medicare's clinician data lists 2 practice locations, including Waltham, MA and Boston, MA. Call before your visit to confirm the address.
- What is Antonia E. Stephen's specialty?
- Medicare lists Surgical Oncology as the primary specialty, and also General Surgery.
- Does Antonia E. Stephen accept Medicare assignment?
- Yes. Medicare's clinician data says Antonia E. Stephen 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.
- Does Antonia E. Stephen offer telehealth?
- Medicare's clinician data says Antonia E. Stephen offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Antonia E. Stephen?
- (781) 487-2900, as listed in official Medicare / NPI Registry data.
- What is Antonia E. Stephen's NPI number?
- 1386626679. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Antonia E. Stephen works
Medicare's Facility Affiliation Data lists Antonia E. Stephen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Massachusetts Eye and Ear Infirmary -Boston, MA · Acute Care Hospital · CCN 220075
- Massachusetts General HospitalBoston, MA · Acute Care Hospital · CCN 220071
- Newton-Wellesley HospitalNewton, MA · Acute Care Hospital · CCN 220101
Practice locations
Addresses where Antonia E. Stephen is enrolled with Medicare (CMS data updated 2026-10-02).
- 40 2nd AveWaltham, MA 02451 (781) 487‑2900
- 55 Fruit StBoston, MA 02114 (617) 726‑2000
Group practices
Medicare enrollment lists Antonia E. Stephen as a member of these groups (CMS data updated 2026-10-02).
- Massachusetts General Physicians Organization Inc3,558 clinicians in the group
- The General Hospital Corporation1,267 clinicians in the group
Specialties
- Surgical Oncologyprimary
- General Surgeryalso
Other surgical oncologists in Waltham
Clinicians with the same Medicare primary specialty in Waltham, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 1996 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1386626679 |
| 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