Catherine E. Oconnor, MD
NPI 1134189434ActiveIndividual· Surgery· Lewiston, ME
Surgery (MD) with Southern Illinois Medical Services Nfp, practicing in Lewiston, Maine. Mostly services rather than prescriptions: Medicare paid $68,816 for 124 patients in 2024, with only 21 Part D claims. Merck Sharp & Dohme LLC reported $19.79 in payments in 2025, mostly food and beverage. Lists Harrisburg Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1134189434 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 23, 2006 |
| Last updated in NPPES | Sep 29, 2025 |
| Certified by provider | Sep 29, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | MD17051 | ME |
| Surgery | 208600000X | 60277802 | NY |
| Surgery | 208600000X | 76180 | MA |
| Surgery | 208600000X | 036158770 | IL |
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 - General Surgery (IL); Practitioner - General Surgery (NV) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 124 |
|---|---|
| Services billed | 442 across 27 procedure codes |
| Paid by Medicare | $68,816 |
Part D prescriptions in 2024
| Prescriptions (claims) | 21 · 21 30-day fills |
|---|---|
| Patients | 14 |
| Total drug cost | $99.27 |
| Generic share | 95% of claims |
Education and affiliations
| Graduation year | 1988 |
|---|---|
| Medicare specialty | General Surgery |
Medical group
- Southern Illinois Medical Services NfpCarterville, IL · 334 clinicians
Hospital affiliations
- Harrisburg Medical CenterHarrisburg, IL
- Herrin HospitalHerrin, IL
- Memorial Hospital of CarbondaleCarbondale, IL
Industry payments (Open Payments)
- 2025$19.79 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $19.79 | 1 |
What the 2025 payments were for
- Food and Beverage$19.79 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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