Quick answers
- Where does Jon P. Gieser see patients?
- Medicare's clinician data lists 2 practice locations, including Wheaton, IL and Naperville, IL. Call before your visit to confirm the address.
- What is Jon P. Gieser's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Jon P. Gieser accept Medicare assignment?
- Yes. Medicare's clinician data says Jon P. Gieser 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 Jon P. Gieser?
- (630) 668-8250, as listed in official Medicare / NPI Registry data.
- What is Jon P. Gieser's NPI number?
- 1235127168. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Jon P. Gieser is enrolled with Medicare (CMS data updated 2026-10-02).
- 2015 N Main StWheaton, IL 60187 (630) 668‑8250
- 604 Raymond DrNaperville, IL 60563 (630) 668‑8250
Group practices
Medicare enrollment lists Jon P. Gieser as a member of this group (CMS data updated 2026-10-02).
- Wheaton Eye Clinic Ltd44 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Wheaton
Clinicians with the same Medicare primary specialty in Wheaton, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Medical School |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235127168 |
| 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
- 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