Timothy E. Jessen, MD
NPI 1831165034ActiveIndividual· Allergy & Immunology· Freeport, IL
Allergy & Immunology (MD) in Freeport, Illinois, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1983). Their prescriptions cost Medicare Part D more than their services did: $427,488 for 1,328 claims, against $185,578 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 9 companies reporting payments in 2025, $545.02 in all, mostly food and beverage.
Overview
| NPI | 1831165034 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 27, 2006 |
| Last updated in NPPES | Oct 23, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | 036077588 | IL |
| Internal Medicine | 207R00000X | 036077588 | 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 - Allergy/Immunology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 236 |
|---|---|
| Services billed | 2,706 across 38 procedure codes |
| Paid by Medicare | $185,578 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,328 · 2,050 30-day fills |
|---|---|
| Patients | 205 |
| Total drug cost | $427,488 |
| Generic share | 64% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 1983 |
| Medicare specialty | Allergy/Immunology |
| Secondary specialties | Internal Medicine |
Medical groups
- Freeport Memorial HospitalFreeport, IL · 178 clinicians
- Freeport Regional Health Care FoundationFreeport, IL · 92 clinicians
Hospital affiliation
- Fhn Memorial HospitalFreeport, IL
Industry payments (Open Payments)
- 2025$545.02 · 27 payments from 9 companies
- 2024$477.22 · 28 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $159.27 | 11 |
| Genzyme Corporation | $149.44 | 8 |
| Sanofi-Aventis U.S. LLC | $98.99 | 1 |
| Genentech USA, Inc. | $45.01 | 2 |
| Regeneron Healthcare Solutions, Inc. | $27.08 | 1 |
What the 2025 payments were for
- Food and Beverage$446.03 · 26 payments
- Education$98.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records