Quick answers
- Which hospitals does John J. McGrath Iii work at?
- Medicare's official clinician data lists John J. McGrath Iii at 5 hospitals: Emerson Hospital -, Lahey Hospital & Medical Center, Burlington, Massachusetts Eye and Ear Infirmary -, Massachusetts General Hospital and Newton-Wellesley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John J. McGrath Iii see patients?
- Medicare's clinician data lists 2 practice locations, including Danvers, MA and Boston, MA. Call before your visit to confirm the address.
- What is John J. McGrath Iii's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does John J. McGrath Iii accept Medicare assignment?
- Yes. Medicare's clinician data says John J. McGrath Iii 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 John J. McGrath Iii offer telehealth?
- Medicare's clinician data says John J. McGrath Iii offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John J. McGrath Iii?
- (978) 882-6100, as listed in official Medicare / NPI Registry data.
- What is John J. McGrath Iii's NPI number?
- 1215913157. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John J. McGrath Iii works
Medicare's Facility Affiliation Data lists John J. McGrath Iii at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Emerson Hospital -W Concord, MA · Acute Care Hospital · CCN 220084
- Lahey Hospital & Medical Center, BurlingtonBurlington, MA · Acute Care Hospital · CCN 220171
- Massachusetts Eye and Ear Infirmary -Boston, MA · Acute Care Hospital · CCN 220075
- Massachusetts General HospitalBoston, MA · Acute Care Hospital · CCN 220071
- Newton-Wellesley HospitalNewton, MA · Acute Care Hospital · CCN 220101
Practice locations
Addresses where John J. McGrath Iii is enrolled with Medicare (CMS data updated 2026-10-02).
- 102 Endicott St, Mgh North Shore MedicalDanvers, MA 01923 (978) 882‑6100
- 55 Fruit StBoston, MA 02114 (617) 724‑0287
Group practices
Medicare enrollment lists John J. McGrath Iii as a member of this group (CMS data updated 2026-10-02).
- Massachusetts General Physicians Organization Inc3,558 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Danvers
Clinicians with the same Medicare primary specialty in Danvers, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Vermont College Of Medicine |
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1215913157 |
| 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