Donald Walter Theisen Wessel, MD
NPI 1538142518ActiveIndividual· Internal Medicine· Stillwater, MN
Internal Medicine (MD) in Stillwater, Minnesota, trained at University of California, San Diego School of Medicine (class of 1989). Their prescriptions cost Medicare Part D more than their services did: $1,289,295 for 13,023 claims, against $180,866 paid for services in 2024.
Overview
| NPI | 1538142518 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 23, 2005 |
| Last updated in NPPES | Nov 26, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 33844 | MN |
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 (MN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 689 |
|---|---|
| Services billed | 6,721 across 62 procedure codes |
| Paid by Medicare | $180,866 |
Part D prescriptions in 2024
| Prescriptions (claims) | 13,023 · 32,194 30-day fills |
|---|---|
| Patients | 1,081 |
| Total drug cost | $1,289,295 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Group Health IncBloomington, MN · 1,638 clinicians
- Amery Regional Medical Center IncAmery, WI · 124 clinicians
Hospital affiliations
- Amery Hospital & ClinicAmery, WI
- Hudson HospitalHudson, WI
- Lakeview Memorial HospitalStillwater, MN
- Regions HospitalSaint Paul, MN
- Westfields Hospital and ClinicNew Richmond, WI
Other facilities
- Accentcare Fairview Home Health - East LLCHome health agency · Oakdale, MN
- Home Health Care IncHome health agency · Golden Valley, MN
- Lakeview HomecareHome health agency · Oak Park Heights, MN
- Lakeview HospiceHospice · Oak Park Heights, MN
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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All 23 internal medicine physicians in Stillwater · All internal medicine physicians in Minnesota