Quick answers
- Which hospitals does Timothy E. Jessen work at?
- Medicare's official clinician data lists Timothy E. Jessen at 1 hospital: FHN Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Timothy E. Jessen see patients?
- Medicare's clinician data lists 1 practice location in Freeport, IL. Call before your visit to confirm the address.
- What is Timothy E. Jessen's specialty?
- Medicare lists Allergy/Immunology as the primary specialty, and also Internal Medicine.
- Does Timothy E. Jessen accept Medicare assignment?
- Yes. Medicare's clinician data says Timothy E. Jessen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Timothy E. Jessen?
- (815) 599-6000, as listed in official Medicare / NPI Registry data.
- What is Timothy E. Jessen's NPI number?
- 1831165034. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Timothy E. Jessen works
Medicare's Facility Affiliation Data lists Timothy E. Jessen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- FHN Memorial HospitalFreeport, IL · Acute Care Hospital · CCN 140160
Practice locations
Addresses where Timothy E. Jessen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1045 W Stephenson StFreeport, IL 61032 (815) 599‑6000
Group practices
Medicare enrollment lists Timothy E. Jessen as a member of these groups (CMS data updated 2026-10-02).
- Freeport Memorial Hospital178 clinicians in the group
- Freeport Regional Health Care Foundation92 clinicians in the group
Specialties
- Allergy/Immunologyprimary
- Internal Medicinealso
Other allergist and immunologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831165034 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians