Gregory Buller, M.D.
NPI 1154321768 · Nephrology Physician · Middlebury, CT
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Buller, M.D. is a Nephrology Physician provider in Middlebury, CT (NPI 1154321768).
Provider details
- NPI number
- 1154321768
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 027195 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$86 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-26
- Last updated
- 2019-09-03
Frequently asked questions
- What is Gregory Buller's NPI number?
- Gregory Buller's National Provider Identifier (NPI) is 1154321768, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Buller's specialty?
- Gregory Buller is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Buller located?
- Gregory Buller's practice location on file with NPPES is 850 Straits Tpke, Middlebury, CT 06762-2843.
- What is Gregory Buller's phone number?
- The practice phone number listed in the NPPES registry for Gregory Buller is (203) 758-1800.
- Does Gregory Buller accept Medicare?
- Gregory Buller is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Buller's NPI active?
- Yes — Gregory Buller's NPI (1154321768) is active in the NPPES registry as of the last update on 2019-09-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.