John Koenig, MD
NPI 1245962620 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Koenig, MD is a Internal Medicine Physician provider in Boston, MA (NPI 1245962620).
Provider details
- NPI number
- 1245962620
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 294432 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 55 Fogg RdWeymouth, MA 02190-2432Phone: (781) 624-8000
Registry dates
- Enumerated
- 2022-06-25
- Last updated
- 2025-08-04
- Certified
- 2025-08-04
Frequently asked questions
- What is John Koenig's NPI number?
- John Koenig's National Provider Identifier (NPI) is 1245962620, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Koenig's specialty?
- John Koenig is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Koenig located?
- John Koenig's practice location on file with NPPES is 736 Cambridge St, Boston, MA 02135-2907.
- What is John Koenig's phone number?
- The practice phone number listed in the NPPES registry for John Koenig is (617) 789-3000.
- Does John Koenig accept Medicare?
- John Koenig is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Koenig's NPI active?
- Yes — John Koenig's NPI (1245962620) is active in the NPPES registry as of the last update on 2025-08-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.