Thomas Keith Duncan, MD
NPI 1588641039ActiveIndividual· Internal Medicine· Neenah, WI
Internal Medicine (MD) in Neenah, Wisconsin, trained at Northwestern University Feinberg Medical School (class of 1975). Their prescriptions cost Medicare Part D more than their services did: $713,154 for 9,289 claims, against $78,602 paid for services in 2024.
Overview
| NPI | 1588641039 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Dec 27, 2005 |
| Last updated in NPPES | Nov 23, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 22196 | WI |
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 (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 223 |
|---|---|
| Services billed | 2,515 across 66 procedure codes |
| Paid by Medicare | $78,602 |
Part D prescriptions in 2024
| Prescriptions (claims) | 9,289 · 21,275 30-day fills |
|---|---|
| Patients | 587 |
| Total drug cost | $713,154 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Northwestern University Feinberg Medical School |
|---|---|
| Graduation year | 1975 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Thedacare, IncorporatedWaupaca, WI · 647 clinicians
Hospital affiliations
- Thedacare Medical Center-WaupacaWaupaca, WI
- Thedacare Regional Med Ctr - NeenahNeenah, WI
- Thedacare Regional Medical Center - Appleton IncAppleton, WI
Other facilities
- Thedacare at HomeHome health agency · Appleton, WI
- Thedacare at HomeHospice · Appleton, 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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