Quick answers
- Where does Mark P. Williams see patients?
- Medicare's clinician data lists 2 practice locations, including Clio, MI. Call before your visit to confirm the address.
- What is Mark P. Williams's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Mark P. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Mark P. Williams 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 Mark P. Williams?
- (810) 686-4240, as listed in official Medicare / NPI Registry data.
- What is Mark P. Williams's NPI number?
- 1518015759. 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 Mark P. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 2155 Vienna RdClio, MI 48420
- 2155 W Vienna RdClio, MI 48420 (810) 686‑4240
Specialties
- Optometryprimary
Other optometrists in Michigan
Clinicians with the same Medicare primary specialty in Michigan — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Southern California College Of Optometry |
| Graduation year | 1977 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518015759 |
| 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