Mark T. O'Brien, D.O.
NPI 1255322509ActiveIndividual· Family Medicine· Saint Clair, MI
Family Medicine (D.O.) in Saint Clair, Michigan, licensed in MI, with an NPI issued in November 2005. Their prescriptions cost Medicare Part D more than their services did: $252,881 for 4,182 claims, against $17,749 paid for services in 2024.
Overview
| NPI | 1255322509 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | Yes |
| NPI issued | Nov 3, 2005 |
| Last updated in NPPES | Feb 25, 2022 |
| Certified by provider | Feb 25, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 5101009744 | MI |
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 - Family Practice (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 111 |
|---|---|
| Services billed | 630 across 30 procedure codes |
| Paid by Medicare | $17,749 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,182 · 8,598 30-day fills |
|---|---|
| Patients | 296 |
| Total drug cost | $252,881 |
| Generic share | 88% of claims |
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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