Quick answers
- Which hospitals does John Koreth work at?
- Medicare's official clinician data lists John Koreth at 1 hospital: Brigham and Women's Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Koreth see patients?
- Medicare's clinician data lists 2 practice locations, including Boston, MA. Call before your visit to confirm the address.
- What is John Koreth's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does John Koreth accept Medicare assignment?
- Yes. Medicare's clinician data says John Koreth 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 John Koreth?
- (617) 632-3000, as listed in official Medicare / NPI Registry data.
- What is John Koreth's NPI number?
- 1396706503. 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 Koreth works
Medicare's Facility Affiliation Data lists John Koreth 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's HospitalBoston, MA · Acute Care Hospital · CCN 220110
Practice locations
Addresses where John Koreth is enrolled with Medicare (CMS data updated 2026-10-02).
- 450 Brookline AveBoston, MA 02215
- 75 Francis StBoston, MA 02115 (617) 632‑3000
Group practices
Medicare enrollment lists John Koreth as a member of this group (CMS data updated 2026-10-02).
- Dana-Farber Cancer Institute, Inc.684 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1396706503 |
| 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