Quick answers
- Does Gregory K. Buller accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory K. Buller accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Gregory K. Buller's NPI number?
- 1154321768. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory K. Buller works
Medicare's Facility Affiliation Data lists Gregory K. Buller at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Bridgeport HospitalBridgeport, CT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 070010
Practice locations
Addresses where Gregory K. Buller is enrolled with Medicare (CMS data updated October 2, 2026).
- 267 Grant StBridgeport, CT 06610 (203) 384‑3000
- 95 Armory RdStratford, CT 06614 (203) 384‑3388
Group practices
Medicare enrollment lists Gregory K. Buller as a member of this group (CMS data updated October 2, 2026).
- Northeast Medical Group Inc1,360 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Connecticut
Clinicians with the same Medicare primary specialty in Connecticut — not a recommendation.
Other clinicians in Northeast Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1980 (46 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154321768 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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