Michael O'Neill, M.D.
NPI 1356873319ActiveIndividual· Internal Medicine· Fairfield, CT
Internal Medicine (M.D.) with Hartford Healthcare Medical Group Specialists PLLC and 1 other group, practicing in Fairfield, Connecticut. Their prescriptions cost Medicare Part D more than their services did: $121,538 for 1,245 claims, against $26,305 paid for services in 2024. Lists Bridgeport Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1356873319 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 29, 2017 |
| Last updated in NPPES | Jun 25, 2025 |
| Certified by provider | Jun 25, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 66914 | CT |
| Hospitalist | 208M00000X | 305546 | NY |
| Hospitalist | 208M00000X | 66914 | CT |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hospitalist (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 118 |
|---|---|
| Services billed | 283 across 28 procedure codes |
| Paid by Medicare | $26,305 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,245 · 2,647 30-day fills |
|---|---|
| Patients | 340 |
| Total drug cost | $121,538 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Hospitalist |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Hartford Healthcare Medical Group Specialists PLLCBridgeport, CT · 1,588 clinicians
- Rehabilitation Associates IncFairfield, CT · 529 clinicians
Hospital affiliations
- Bridgeport HospitalBridgeport, CT
- St Vincent's Medical CenterBridgeport, CT
Other facilities
- Hartford Healthcare at HomeHome health agency · East Hartford, CT
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 52 internal medicine physicians in Fairfield · All internal medicine physicians in Connecticut