Gregory D'Onofrio, M.D.
NPI 1255304796 · Cardiovascular Disease Physician · Stamford, CT
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory D'Onofrio, M.D. is a Cardiovascular Disease Physician provider in Stamford, CT (NPI 1255304796).
Provider details
- NPI number
- 1255304796
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 149608 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
828 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 284 | $8 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 280 | $148 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 55 | $15 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 52 | $184 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 47 | $67 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 38 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 247 | 74 |
| Amlodipine Besylate | 199 | 70 |
| Atorvastatin Calcium | 193 | 59 |
| Apixabanbrand: Eliquis | 155 | 46 |
| Losartan Potassium | 127 | 42 |
| Furosemide | 123 | 48 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-07
- Last updated
- 2023-09-07
Frequently asked questions
- What is Gregory D'Onofrio's NPI number?
- Gregory D'Onofrio's National Provider Identifier (NPI) is 1255304796, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory D'Onofrio's specialty?
- Gregory D'Onofrio is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory D'Onofrio located?
- Gregory D'Onofrio's practice location on file with NPPES is 29 Hospital Plaza, Stamford, CT 06902-3602.
- What is Gregory D'Onofrio's phone number?
- The practice phone number listed in the NPPES registry for Gregory D'Onofrio is (203) 348-7410.
- Does Gregory D'Onofrio accept Medicare?
- Gregory D'Onofrio is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory D'Onofrio's NPI active?
- Yes — Gregory D'Onofrio's NPI (1255304796) is active in the NPPES registry as of the last update on 2023-09-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.