Katrina Ruth Hammel, M.D.
NPI 1780894527ActiveIndividual· Internal Medicine· Winona, MN
Internal Medicine (M.D.) in Winona, Minnesota, trained at University of Iowa, Rj & L Carver College of Medicine (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $1,718,411 for 17,222 claims, against $81,636 paid for services in 2024.
Overview
| NPI | 1780894527 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 23, 2007 |
| Last updated in NPPES | Feb 6, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 55911 | MN |
| Internal Medicine | 207R00000X | 37932 | IA |
| Internal Medicine | 207R00000X | 54557 | 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 (MN); Practitioner - Internal Medicine (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 530 |
|---|---|
| Services billed | 1,570 across 42 procedure codes |
| Paid by Medicare | $81,636 |
Part D prescriptions in 2024
| Prescriptions (claims) | 17,222 · 29,318 30-day fills |
|---|---|
| Patients | 941 |
| Total drug cost | $1,718,411 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | University of Iowa, Rj & L Carver College of Medicine |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Internal Medicine |
Medical group
- Winona Health ServicesWinona, MN · 169 clinicians
Hospital affiliations
- Gundersen Lutheran Medical CenterLa Crosse, WI
- Gundersen Tri-County Hospital & ClinicsWhitehall, WI
- Mayo Clinic Health System OakridgeOsseo, WI
- Mayo Clinic Health System-Franciscan Medical Center IncLa Crosse, WI
- Winona Health ServicesWinona, MN
Other facilities
- Aveanna Home HealthHome health agency · Rochester, MN
- St Croix Hospice Eau ClaireHospice · Eau Claire, WI
- Winona Area Hospice ServicesHospice · Winona, MN
- Lake Winona ManorNursing home · Winona, MN
- Pigeon Falls HccNursing home · Pigeon Falls, 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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