Quick answers
- Which hospitals does Sandra V. Leyan Castillo work at?
- Medicare's official clinician data lists Sandra V. Leyan Castillo at 1 hospital: Massachusetts General Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sandra V. Leyan Castillo see patients?
- Medicare's clinician data lists 2 practice locations, including Charlestown, MA and Boston, MA. Call before your visit to confirm the address.
- What is Sandra V. Leyan Castillo's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Sandra V. Leyan Castillo accept Medicare assignment?
- Medicare's clinician data says Sandra V. Leyan Castillo may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Sandra V. Leyan Castillo?
- (857) 238-1100, as listed in official Medicare / NPI Registry data.
- What is Sandra V. Leyan Castillo's NPI number?
- 1548922875. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sandra V. Leyan Castillo works
Medicare's Facility Affiliation Data lists Sandra V. Leyan Castillo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Massachusetts General HospitalBoston, MA · Acute Care Hospital · CCN 220071
Practice locations
Addresses where Sandra V. Leyan Castillo is enrolled with Medicare (CMS data updated 2026-10-02).
- 15 Tufts StCharlestown, MA 02129 (857) 238‑1100
- 332 Hanover StBoston, MA 02113 (617) 643‑8000
Group practices
Medicare enrollment lists Sandra V. Leyan Castillo as a member of this group (CMS data updated 2026-10-02).
- North End Community Health Committee, Inc.55 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Charlestown
Clinicians with the same Medicare primary specialty in Charlestown, MA — not a recommendation.
Clinician information
| Graduation year | 2019 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1548922875 |
| 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