Thorvardur R. Halfdanarson, M.D.
NPI 1083684187ActiveIndividual· Internal Medicine, Medical Oncology· Rochester, MN
Internal Medicine, Medical Oncology (M.D.) with Mayo Clinic, practicing in Rochester, Minnesota. In 2024 Medicare paid $1,538,207 for 440 patients, and Part D covered 153 of their prescriptions, 65% of them generic. Genzyme Corporation was the largest of 6 companies reporting payments in 2025, $27,451 in all, mostly travel and lodging. Lists Mayo Clinic Health System New Prague and 1 other hospital as hospital affiliations.
Overview
| NPI | 1083684187 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 23, 2006 |
| Last updated in NPPES | Aug 14, 2020 |
| Certified by provider | Aug 14, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 45995 | MN |
| Internal Medicine | 207R00000X | 45995 | MN |
| Internal Medicine | 207R00000X | 37199 | IA |
| Internal Medicine, Hematology & Oncology | 207RH0003X | 37199 | IA |
| Internal Medicine, Hematology & Oncology | 207RH0003X | 46666 | AZ |
| Internal Medicine, Hematology & Oncology | 207RH0003X | 45995 | MN |
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 - Medical Oncology (MN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 440 |
|---|---|
| Services billed | 59,372 across 120 procedure codes |
| Paid by Medicare | $1,538,207 |
Part D prescriptions in 2024
| Prescriptions (claims) | 153 · 205 30-day fills |
|---|---|
| Patients | 55 |
| Total drug cost | $311,098 |
| Generic share | 65% of claims |
Education and affiliations
| Graduation year | 1995 |
|---|---|
| Medicare specialty | Medical Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Mayo ClinicRochester, MN · 4,956 clinicians
Hospital affiliations
- Mayo Clinic Health System New PragueNew Prague, MN
- Mayo Clinic Hospital RochesterRochester, MN
Industry payments (Open Payments)
- 2025$27,451 · 14 payments from 6 companies
- 2024$17,812 · 19 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $16,790 | 4 |
| E.R. Squibb & Sons, L.L.C. | $3,719 | 3 |
| Exelixis Inc. | $3,588 | 4 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $1,850 | 1 |
| Boehringer Ingelheim International Gmbh | $1,480 | 1 |
What the 2025 payments were for
- Travel and Lodging$12,897 · 4 payments
- Consulting Fee$10,854 · 3 payments
- Honoraria$3,300 · 1 payment
- Food and Beverage$399.94 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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