Quick answers
- Where does John M. Guest see patients?
- Medicare's clinician data lists 1 practice location in Saint Clair Shores, MI. Call before your visit to confirm the address.
- What is John M. Guest's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does John M. Guest accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Guest 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 John M. Guest?
- (810) 774-0393, as listed in official Medicare / NPI Registry data.
- What is John M. Guest's NPI number?
- 1235796780. 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 John M. Guest is enrolled with Medicare (CMS data updated 2026-10-02).
- 21711 Greater Mack AveSaint Clair Shores, MI 48080 (810) 774‑0393
Group practices
Medicare enrollment lists John M. Guest as a member of this group (CMS data updated 2026-10-02).
- Richard C Mertz Jr MD PC5 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Saint Clair Shores
Clinicians with the same Medicare primary specialty in Saint Clair Shores, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235796780 |
| 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