Quick answers
- Which hospitals does John Koenig work at?
- Medicare's official clinician data lists John Koenig at 2 hospitals: Brigham and Women's Hospital and South Shore Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Koenig see patients?
- Medicare's clinician data lists 1 practice location in Weymouth, MA. Call before your visit to confirm the address.
- What is John Koenig's specialty?
- Medicare lists Hospitalist as the primary specialty.
- Does John Koenig accept Medicare assignment?
- Yes. Medicare's clinician data says John Koenig 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 Koenig?
- (781) 792-4136, as listed in official Medicare / NPI Registry data.
- What is John Koenig's NPI number?
- 1245962620. 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 Koenig works
Medicare's Facility Affiliation Data lists John Koenig 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
- South Shore HospitalSouth Weymouth, MA · Acute Care Hospital · CCN 220100
Practice locations
Addresses where John Koenig is enrolled with Medicare (CMS data updated 2026-10-02).
- 55 Fogg RdWeymouth, MA 02190 (781) 792‑4136
Group practices
Medicare enrollment lists John Koenig as a member of this group (CMS data updated 2026-10-02).
- Coastal Medical Associates443 clinicians in the group
Specialties
- Hospitalistprimary
Other hospitalists in Weymouth
Clinicians with the same Medicare primary specialty in Weymouth, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1245962620 |
| 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