DR. JOHN KOENIG MD
NPI 1245962620
Internal Medicine in Boston, MA
About Dr. John Koenig Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN KOENIG MD (NPI 1245962620) is an individual internal medicine provider in Boston, Massachusetts, licensed in Massachusetts (294432) and active in the NPI registry since June 2022. He is enrolled in Medicare PECOS, is affiliated with South Shore Hospital, and maintains a secondary practice location in Weymouth.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John Koenig Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
South Shore Hospital
Acute Care Hospitals · South Weymouth, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02135 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02135
BRIGHTON, MA 02135
BOSTON, MA 02135
BRIGHTON, MA 02135
BRIGHTON, MA 02135
BOSTON, MA 02135
BRIGHTON, MA 02135
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Koenig's NPI number?
The NPI number for John Koenig is 1245962620. It was assigned to this individual provider in the NPPES registry on June 25, 2022.
Where is John Koenig located?
John Koenig practices at 736 Cambridge St, Boston, MA 02135. The listed phone number is (617) 789-3000.
What is John Koenig's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Koenig enrolled in Medicare?
Yes. John Koenig is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Is John Koenig affiliated with any hospitals?
According to CMS data, John Koenig is affiliated with South Shore Hospital.
When was this NPI record last updated?
The NPPES record for John Koenig was last updated on August 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. John Koenig, MD · NPI 1245962620
Internal Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since June 25, 2022.
## Identity
- **NPI:** 1245962620 (Entity type: Individual)
- **Enumerated:** June 25, 2022
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 294432 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 736 CAMBRIDGE ST, Boston, MA 02135-2907
- **Phone:** (617) 789-3000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Medical school:** Other, class of 2022
## Record status
- **NPPES last updated:** August 4, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1245962620) · Data from the CMS NPPES public registry.