Joan M. McMahon, MD
NPI 1467403345ActiveIndividual· Internal Medicine· Lewistown, MT
Internal Medicine (MD) in Lewistown, Montana, licensed in MT, with an NPI issued in May 2006. Their prescriptions cost Medicare Part D more than their services did: $118,566 for 1,916 claims, against $1,569 paid for services in 2024.
Overview
| NPI | 1467403345 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 15, 2006 |
| Last updated in NPPES | Jun 19, 2024 |
| Certified by provider | Jun 19, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MED-PHYS-LIC-9666 | MT |
| Hospitalist | 208M00000X | MED-PHYS-LIC-9666 | MT |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (MT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 14 |
|---|---|
| Services billed | 20 across 10 procedure codes |
| Paid by Medicare | $1,569 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,916 · 3,325 30-day fills |
|---|---|
| Patients | 302 |
| Total drug cost | $118,566 |
| 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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