Mark D. Horneffer, MD
NPI 1710928965ActiveIndividual· Internal Medicine· Wauwatosa, WI
Internal Medicine (MD) in Wauwatosa, Wisconsin, trained at University of Michigan Medical School (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $824,650 for 7,931 claims, against $48,564 paid for services in 2024.
Overview
| NPI | 1710928965 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 9, 2006 |
| Last updated in NPPES | Jun 12, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 34632 | 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 | 169 |
|---|---|
| Services billed | 655 across 23 procedure codes |
| Paid by Medicare | $48,564 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,931 · 17,569 30-day fills |
|---|---|
| Patients | 459 |
| Total drug cost | $824,650 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | University of Michigan Medical School |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Columbia St Marys Hospital Milwaukee IncMilwaukee, WI · 306 clinicians
Hospital affiliations
- Ascension Columbia St Marys Hospital MilwaukeeMilwaukee, WI
- Ascension Se Wisconsin HospitalMilwaukee, WI
Other facilities
- Ascension at HomeHome health agency · Milwaukee, WI
- Horizon Home Care and HospiceHome health agency · Milwaukee, WI
- Brighton Hospice WisconsinHospice · Brookfield, WI
- Luther ManorNursing home · Milwaukee, 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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All 52 internal medicine physicians in Wauwatosa · All internal medicine physicians in Wisconsin