Sean M. O'Brien, D.O.
NPI 1912994500ActiveIndividual· Internal Medicine· Nogales, AZ
Internal Medicine (D.O.) in Nogales, Arizona, trained at At Still University of Health Sciences, College of Osteo Med, Kirksville (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $696,050 for 3,633 claims, against $2,677 paid for services in 2024. Amgen Inc. reported $90.00 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1912994500 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Sep 29, 2005 |
| Last updated in NPPES | Jan 17, 2024 |
| Certified by provider | Jan 17, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 2883 | AZ |
| Internal Medicine, Nephrology | 207RN0300X | 2883 | AZ |
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 - Internal Medicine (AZ); Practitioner - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 45 |
|---|---|
| Services billed | 96 across 29 procedure codes |
| Paid by Medicare | $2,677 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,633 · 8,716 30-day fills |
|---|---|
| Patients | 449 |
| Total drug cost | $696,050 |
| Generic share | 74% of claims |
Education and affiliations
| Medical school | At Still University of Health Sciences, College of Osteo Med, Kirksville |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Internal Medicine |
Medical group
- Mariposa Community Health Center IncNogales, AZ · 35 clinicians
Industry payments (Open Payments)
- 2025$90.00 · 1 payment from 1 company
- 2024$36.50 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $90.00 | 1 |
What the 2025 payments were for
- Food and Beverage$90.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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