Mark Warren Hiser, M.D.
NPI 1538184924ActiveIndividual· Internal Medicine, Cardiovascular Disease· Rockford, IL
Internal Medicine, Cardiovascular Disease (M.D.) with Osf Multi-Specialty Group, practicing in Rockford, Illinois. Their prescriptions cost Medicare Part D more than their services did: $327,905 for 1,960 claims, against $21,743 paid for services in 2024. Abbott Laboratories reported $43.95 in payments in 2025, mostly food and beverage. Lists Rochelle Community Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1538184924 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 13, 2006 |
| Last updated in NPPES | Nov 11, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | 36055207 | IL |
| Internal Medicine, Clinical Cardiac Electrophysiology | 207RC0001X | 36055207 | IL |
| Internal Medicine, Interventional Cardiology | 207RI0011X | 36055207 | IL |
| Radiology, Body Imaging | 2085B0100X | 36055207 | IL |
| Radiology, Diagnostic Ultrasound | 2085U0001X | 36055207 | IL |
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 - Cardiac Electrophysiology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 398 |
|---|---|
| Services billed | 927 across 27 procedure codes |
| Paid by Medicare | $21,743 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,960 · 5,159 30-day fills |
|---|---|
| Patients | 250 |
| Total drug cost | $327,905 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 1972 |
|---|---|
| Medicare specialty | Cardiac Electrophysiology |
| Secondary specialties | Cardiovascular Disease (Cardiology) |
Medical group
- Osf Multi-Specialty GroupMorton, IL · 2,114 clinicians
Hospital affiliations
- Rochelle Community HospitalRochelle, IL
- Saint Anthony Medical CenterRockford, IL
Industry payments (Open Payments)
- 2025$43.95 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbott Laboratories | $43.95 | 2 |
What the 2025 payments were for
- Food and Beverage$43.95 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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