Quick answers
- Where does Jack G. Guenther see patients?
- Medicare's clinician data lists 1 practice location in Mokena, IL. Call before your visit to confirm the address.
- What is Jack G. Guenther's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Jack G. Guenther accept Medicare assignment?
- Yes. Medicare's clinician data says Jack G. Guenther 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 Jack G. Guenther?
- (708) 479-1616, as listed in official Medicare / NPI Registry data.
- What is Jack G. Guenther's NPI number?
- 1215047063. 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 Jack G. Guenther is enrolled with Medicare (CMS data updated 2026-10-02).
- 19607 S La Grange RdMokena, IL 60448 (708) 479‑1616
Specialties
- Optometryprimary
Other optometrists in Mokena
Clinicians with the same Medicare primary specialty in Mokena, IL — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Graduation year | 1990 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215047063 |
| 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