Eileen Anne O'Halloran, M.D.
NPI 1447549571ActiveIndividual· Surgery· Saint Louis, MO
Surgery (M.D.) in Saint Louis, Missouri, trained at Loyola University of Chicago, Stritch School of Medicine (class of 2011). 55 Medicare patients in 2024, $21,888 paid; nearly all of their 54 Part D prescriptions were generic (94%). Siemens Medical Solutions USA, Inc. was the largest of 6 companies reporting payments in 2025, $248.50 in all, mostly food and beverage.
Overview
| NPI | 1447549571 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 29, 2011 |
| Last updated in NPPES | Aug 29, 2024 |
| Certified by provider | Aug 29, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 2024028245 | MO |
| Surgery | 208600000X | 036.134096 | 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 (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 55 |
|---|---|
| Services billed | 116 across 45 procedure codes |
| Paid by Medicare | $21,888 |
Part D prescriptions in 2024
| Prescriptions (claims) | 54 · 61 30-day fills |
|---|---|
| Patients | 27 |
| Total drug cost | $4,634 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | Loyola University of Chicago, Stritch School of Medicine |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | General Surgery |
| Telehealth | Offers telehealth |
Medical group
- Mercy Clinic Surgical Specialists LLCSaint Louis, MO · 182 clinicians
Hospital affiliations
- Mercy Hospital SouthSaint Louis, MO
- Mercy Hospital SpringfieldSpringfield, MO
- Mercy Hospital St LouisSaint Louis, MO
Industry payments (Open Payments)
- 2025$248.50 · 7 payments from 6 companies
- 2024$286.74 · 8 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Siemens Medical Solutions USA, Inc. | $105.81 | 1 |
| Daiichi Sankyo Inc. | $49.47 | 2 |
| Eisai Inc. | $31.14 | 1 |
| Pharmaessentia USA Corporation | $23.01 | 1 |
| Genmab U.S., Inc. | $20.67 | 1 |
What the 2025 payments were for
- Food and Beverage$248.50 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 273 general surgeons in Saint Louis · All general surgeons in Missouri