Quick answers
- Which hospitals does Michael Johnstone work at?
- Medicare's official clinician data lists Michael Johnstone at 5 hospitals: Boston Medical Center, Boston Medical Center-Brighton, Good Samaritan Medical Center, Holy Family Hospital and Merrimack Health Lawrence Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael Johnstone see patients?
- Medicare's clinician data lists 4 practice locations, including Brighton, MA. Call before your visit to confirm the address.
- What is Michael Johnstone's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Internal Medicine.
- Does Michael Johnstone accept Medicare assignment?
- Yes. Medicare's clinician data says Michael Johnstone 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 Johnstone?
- (617) 789-3000, as listed in official Medicare / NPI Registry data.
- What is Michael Johnstone's NPI number?
- 1235164336. 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 Johnstone works
Medicare's Facility Affiliation Data lists Michael Johnstone at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Boston Medical CenterBoston, MA · Acute Care Hospital · CCN 220031
- Boston Medical Center-BrightonBrighton, MA · Acute Care Hospital · CCN 220036
- Good Samaritan Medical CenterBrockton, MA · Acute Care Hospital · CCN 220111
- Holy Family HospitalMethuen, MA · Acute Care Hospital · CCN 220080
- Merrimack Health Lawrence HospitalLawrence, MA · Acute Care Hospital · CCN 220010
Practice locations
Addresses where Michael Johnstone is enrolled with Medicare (CMS data updated 2026-10-02).
- 736 Cambridge StBrighton, MA 02135 (617) 789‑3000
- 77 Warren StBrighton, MA 02135
- 77 Warren St 1st Floor, St Elizabeths Health Care at BmhcBrighton, MA 02135
- 77 Warren St 1st Floor and 2nd Floor, St Elizabeths Health Care at BmhcBrighton, MA 02135 (617) 562‑5200
Group practices
Medicare enrollment lists Michael Johnstone as a member of these groups (CMS data updated 2026-10-02).
- BMC Affiliated Physicians, Inc.564 clinicians in the group
- Steward St Elizabeths Medical Center of Boston Inc9 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Massachusetts →
Other cardiologists in Brighton
Clinicians with the same Medicare primary specialty in Brighton, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | M H Kornberg School Of Dentistry, Temple University |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235164336 |
| 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