Donald David Nimmer, M.D.
NPI 1477555951ActiveIndividual· Family Medicine· Greenfield, WI
Family Medicine (M.D.) in Greenfield, Wisconsin, trained at Medical College of Wisconsin (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $485,026 for 7,761 claims, against $56,231 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 2 companies reporting payments in 2025, $50.67 in all, mostly food and beverage.
Overview
| NPI | 1477555951 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 13, 2005 |
| Last updated in NPPES | Sep 19, 2022 |
| Certified by provider | Sep 19, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 29494 | 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 - Family Practice (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 168 |
|---|---|
| Services billed | 802 across 25 procedure codes |
| Paid by Medicare | $56,231 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,761 · 19,684 30-day fills |
|---|---|
| Patients | 555 |
| Total drug cost | $485,026 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Medical College of Wisconsin |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Family Practice |
Medical group
- Ascension Medical Group-Southeast Wisconsin IncBrookfield, WI · 545 clinicians
Hospital affiliations
- Ascension Se Wisconsin HospitalMilwaukee, WI
- Ascension St Francis HospitalMilwaukee, WI
- West Allis Memorial HospitalWest Allis, WI
Other facilities
- Ascension at HomeHome health agency · Milwaukee, WI
Industry payments (Open Payments)
- 2025$50.67 · 2 payments from 2 companies
- 2024$24.76 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $25.45 | 1 |
| Dynavax Technologies Corporation | $25.22 | 1 |
What the 2025 payments were for
- Food and Beverage$50.67 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 41 family medicine physicians in Greenfield · All family medicine physicians in Wisconsin