Thom S. Thomassen, MD
NPI 1407903180ActiveIndividual· Ophthalmology· Janesville, WI
Ophthalmology (MD) in Janesville, Wisconsin, trained at Duke University School of Medicine (class of 1977). Their prescriptions cost Medicare Part D more than their services did: $51,723 for 315 claims, against $12,808 paid for services in 2024.
Overview
| NPI | 1407903180 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 4, 2007 |
| Last updated in NPPES | Sep 29, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | 34177 | WI |
| Ophthalmology | 207W00000X | 036-092307 | IL |
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 - Ophthalmology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 124 |
|---|---|
| Services billed | 219 across 14 procedure codes |
| Paid by Medicare | $12,808 |
Part D prescriptions in 2024
| Prescriptions (claims) | 315 · 685 30-day fills |
|---|---|
| Patients | 63 |
| Total drug cost | $51,723 |
| Generic share | 71% of claims |
Education and affiliations
| Medical school | Duke University School of Medicine |
|---|---|
| Graduation year | 1977 |
| Medicare specialty | Ophthalmology |
Medical group
- Mercy Health System CorporationJanesville, WI · 753 clinicians
Hospital affiliation
- Mercy Health System CorpJanesville, WI
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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