Oliver B. Diaz, M.D.
NPI 1124037312ActiveIndividual· Internal Medicine· Bristol, CT
Internal Medicine (M.D.) in Bristol, Connecticut, licensed in CT, with an NPI issued in August 2006. Their prescriptions cost Medicare Part D more than their services did: $1,138,737 for 10,751 claims, against $29,694 paid for services in 2024. Lilly USA, LLC was the largest of 2 companies reporting payments in 2025, $227.21 in all, mostly food and beverage. Lists Bristol Hospital as a hospital affiliation.
Overview
| NPI | 1124037312 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 5, 2006 |
| Last updated in NPPES | Jun 9, 2020 |
| Certified by provider | Jun 9, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 016620 | CT |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 113 |
|---|---|
| Services billed | 427 across 15 procedure codes |
| Paid by Medicare | $29,694 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,751 · 20,490 30-day fills |
|---|---|
| Patients | 415 |
| Total drug cost | $1,138,737 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1968 |
|---|---|
| Medicare specialty | Internal Medicine |
Hospital affiliation
- Bristol HospitalBristol, CT
Other facilities
- Bristol Hospital Home Care AgencyHome health agency · Bristol, CT
- Hartford Healthcare at HomeHome health agency · East Hartford, CT
Industry payments (Open Payments)
- 2025$227.21 · 2 payments from 2 companies
- 2024$69.89 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $123.06 | 1 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $104.15 | 1 |
What the 2025 payments were for
- Food and Beverage$227.21 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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