Quick answers
- Which hospitals does Justin Granstein work at?
- Medicare's official clinician data lists Justin Granstein at 3 hospitals: Beth Israel Deaconess Hospital Plymouth, Beth Israel Deaconess Medical Center and Cape Cod Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Justin Granstein see patients?
- Medicare's clinician data lists 1 practice location in Boston, MA. Call before your visit to confirm the address.
- What is Justin Granstein's specialty?
- Medicare lists Neurology as the primary specialty.
- Does Justin Granstein accept Medicare assignment?
- Yes. Medicare's clinician data says Justin Granstein 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 Justin Granstein offer telehealth?
- Medicare's clinician data says Justin Granstein offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Justin Granstein?
- (617) 632-7246, as listed in official Medicare / NPI Registry data.
- What is Justin Granstein's NPI number?
- 1699169599. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Justin Granstein works
Medicare's Facility Affiliation Data lists Justin Granstein 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 PlymouthPlymouth, MA · Acute Care Hospital · CCN 220060
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
- Cape Cod HospitalHyannis, MA · Acute Care Hospital · CCN 220012
Practice locations
Addresses where Justin Granstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 110 Francis StBoston, MA 02215 (617) 632‑7246
Group practices
Medicare enrollment lists Justin Granstein 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
- Neurologyprimary
Other neurologists in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1699169599 |
| 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