Quick answers
- Which hospitals does Megan B. Callahan work at?
- Medicare's official clinician data lists Megan B. Callahan at 4 hospitals: Brigham and Women Faulkner Hospital, Brigham and Women's Hospital, Massachusetts General Hospital and Newton-Wellesley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Megan B. Callahan see patients?
- Medicare's clinician data lists 8 practice locations, including Everett, MA, Jamaica Plain, MA and Newton, MA. Call before your visit to confirm the address.
- What is Megan B. Callahan's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Megan B. Callahan accept Medicare assignment?
- Yes. Medicare's clinician data says Megan B. Callahan 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 Megan B. Callahan?
- (617) 389-6270, as listed in official Medicare / NPI Registry data.
- What is Megan B. Callahan's NPI number?
- 1881662864. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Megan B. Callahan works
Medicare's Facility Affiliation Data lists Megan B. Callahan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Brigham and Women Faulkner HospitalJamaica Plain, MA · Acute Care Hospital · CCN 220119
- Brigham and Women's HospitalBoston, MA · Acute Care Hospital · CCN 220110
- Massachusetts General HospitalBoston, MA · Acute Care Hospital · CCN 220071
- Newton-Wellesley HospitalNewton, MA · Acute Care Hospital · CCN 220101
Practice locations
Addresses where Megan B. Callahan is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 8; the Medicare profile lists all.
- 103 Garland StEverett, MA 02149 (617) 389‑6270
- 1153 Centre StJamaica Plain, MA 02130 (617) 726‑4121
- 2014 Washington StNewton, MA 02462 (617) 243‑6040
- 230 Highland AveSomerville, MA 02143 (617) 591‑4500
- 47 Middlesex TpkeBurlington, MA 01803 (857) 282‑8100
Group practices
Medicare enrollment lists Megan B. Callahan as a member of these groups (CMS data updated 2026-10-02).
- Cambridge Public Health Commission656 clinicians in the group
- Mass General Brigham Medical Group, Inc.139 clinicians in the group
- Charter LTC LLC20 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Everett
Clinicians with the same Medicare primary specialty in Everett, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1998 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1881662864 |
| 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