Ronald Anthony Zimmermann, D.O.
NPI 1346404985ActiveIndividual· Hospitalist· Naperville, IL
Hospitalist (D.O.) in Naperville, Illinois, trained at Lake Erie College of Osteopathic Medicine, Erie (class of 2008). In 2024 Medicare paid $95,245 for 624 patients, and Part D covered 152 of their prescriptions, 72% of them generic. Viatris Specialty LLC reported $21.85 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1346404985 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Jul 14, 2008 |
| Last updated in NPPES | Dec 10, 2021 |
| Certified by provider | Dec 10, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Hospitalist Primary | 208M00000X | 036.128777 | IL |
| Internal Medicine | 207R00000X | 125054800 | IL |
| Internal Medicine | 207R00000X | 036128777 | IL |
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 (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 624 |
|---|---|
| Services billed | 758 across 13 procedure codes |
| Paid by Medicare | $95,245 |
Part D prescriptions in 2024
| Prescriptions (claims) | 152 · 231 30-day fills |
|---|---|
| Patients | 49 |
| Total drug cost | $15,424 |
| Generic share | 72% of claims |
Education and affiliations
| Medical school | Lake Erie College of Osteopathic Medicine, Erie |
|---|---|
| Graduation year | 2008 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Hospitalist |
Medical groups
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
- Sound Physicians of Illinois LLCLake Saint Louis, MO · 193 clinicians
Hospital affiliations
- Copley Memorial HospitalAurora, IL
- Edward HospitalNaperville, IL
- Osf Sacred Heart Medical CenterDanville, IL
- Swedish HospitalChicago, IL
Industry payments (Open Payments)
- 2025$21.85 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Viatris Specialty LLC | $21.85 | 1 |
What the 2025 payments were for
- Food and Beverage$21.85 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 45 hospitalists in Naperville · All hospitalists in Illinois