Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. John Koenig, MD

Individual provider Internal Medicine Physician · NPI 1245962620

Dr. John Koenig, MD is a Hospitalist in Boston, Massachusetts. Qualified in 2022, 4 years ago. Practices with Coastal Medical Associates, a 446-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
4
Licensed in
MA
In the registry since
2022
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

736 Cambridge St
Boston, MA 02135-2907
Phone: (617) 789-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 55 Fogg Rd, Weymouth, MA 02190-2432 — (781) 624-8000

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 294432 (MA)

Record details

NPI number1245962620
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 25, 2022
Last updated in NPPESAugust 4, 2025
Certification dateAugust 4, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHOSPITALIST
Medical schoolOTHER
Graduated 2022 (4 years in practice)
Group practice Coastal Medical Associates — 446 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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