Quick answers
- Which hospitals does Alexander Castro work at?
- Medicare's official clinician data lists Alexander Castro at 2 hospitals: Beth Israel Deaconess Hospital - Milton and Beth Israel Deaconess Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alexander Castro see patients?
- Medicare's clinician data lists 1 practice location in Boston, MA. Call before your visit to confirm the address.
- What is Alexander Castro's specialty?
- Medicare lists Hospitalist as the primary specialty.
- Does Alexander Castro accept Medicare assignment?
- Yes. Medicare's clinician data says Alexander Castro 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 Alexander Castro?
- (617) 754-8612, as listed in official Medicare / NPI Registry data.
- What is Alexander Castro's NPI number?
- 1356043590. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alexander Castro works
Medicare's Facility Affiliation Data lists Alexander Castro 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 - MiltonMilton, MA · Acute Care Hospital · CCN 220108
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
Practice locations
Addresses where Alexander Castro is enrolled with Medicare (CMS data updated 2026-10-02).
- 330 Brookline AveBoston, MA 02215 (617) 754‑8612
Group practices
Medicare enrollment lists Alexander Castro as a member of this group (CMS data updated 2026-10-02).
- Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc1,740 clinicians in the group
Specialties
- Hospitalistprimary
Other hospitalists in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Pittsburgh School Of Medicine |
| Graduation year | 2023 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1356043590 |
| 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