Thomas A. Johnson, MD
NPI 1891762852ActiveIndividual· Internal Medicine· Brookfield, WI
Internal Medicine (MD) in Brookfield, Wisconsin, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1976). Their prescriptions cost Medicare Part D more than their services did: $996,829 for 13,139 claims, against $105,633 paid for services in 2024. Amgen Inc. was the largest of 11 companies reporting payments in 2025, $659.51 in all, mostly food and beverage.
Overview
| NPI | 1891762852 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 8, 2006 |
| Last updated in NPPES | Aug 22, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 26997 | WI |
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 (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 370 |
|---|---|
| Services billed | 1,256 across 35 procedure codes |
| Paid by Medicare | $105,633 |
Part D prescriptions in 2024
| Prescriptions (claims) | 13,139 · 32,045 30-day fills |
|---|---|
| Patients | 1,131 |
| Total drug cost | $996,829 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 1976 |
| Medicare specialty | Internal Medicine |
Medical group
- Ascension Medical Group-Southeast Wisconsin IncBrookfield, WI · 545 clinicians
Hospital affiliations
- Ascension Columbia St Marys Hospital MilwaukeeMilwaukee, WI
- Ascension Se Wisconsin HospitalMilwaukee, WI
- Froedtert Memorial Lutheran HospitalMilwaukee, WI
- Waukesha Memorial HospitalWaukesha, WI
Other facilities
- Ascension at HomeHome health agency · Milwaukee, WI
Industry payments (Open Payments)
- 2025$659.51 · 33 payments from 11 companies
- 2024$25.44 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $152.10 | 8 |
| E.R. Squibb & Sons, L.L.C. | $89.62 | 4 |
| Pfizer Inc. | $83.46 | 4 |
| Novo Nordisk Inc | $67.12 | 4 |
| Astrazeneca Pharmaceuticals LP | $54.73 | 2 |
What the 2025 payments were for
- Food and Beverage$659.51 · 33 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 48 internal medicine physicians in Brookfield · All internal medicine physicians in Wisconsin