Quick answers
- Which hospitals does Adam L. Johnson work at?
- Medicare's official clinician data lists Adam L. Johnson at 1 hospital: Massachusetts General Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Adam L. Johnson see patients?
- Medicare's clinician data lists 3 practice locations, including Boston, MA and Newton, MA. Call before your visit to confirm the address.
- What is Adam L. Johnson's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Cardiovascular Disease (Cardiology).
- Does Adam L. Johnson accept Medicare assignment?
- Medicare's clinician data says Adam L. Johnson may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Adam L. Johnson's NPI number?
- 1104314228. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Adam L. Johnson works
Medicare's Facility Affiliation Data lists Adam L. Johnson 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 Adam L. Johnson is enrolled with Medicare (CMS data updated 2026-10-02).
Specialties
Other internal medicine doctors in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2018 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1104314228 |
| 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