Quick answers
- Where does John R. Markham see patients?
- Medicare's clinician data lists 2 practice locations, including Prescott, AZ and Cottonwood, AZ. Call before your visit to confirm the address.
- What is John R. Markham's specialty?
- Medicare lists Optometry as the primary specialty.
- Does John R. Markham accept Medicare assignment?
- Yes. Medicare's clinician data says John R. Markham 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 R. Markham?
- (928) 776-7477, as listed in official Medicare / NPI Registry data.
- What is John R. Markham's NPI number?
- 1225094550. 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 R. Markham is enrolled with Medicare (CMS data updated 2026-10-02).
- 1600 Willow Creek RdPrescott, AZ 86301 (928) 776‑7477
- 270 S Candy LnCottonwood, AZ 86326 (928) 634‑4202
Group practices
Medicare enrollment lists John R. Markham as a member of this group (CMS data updated 2026-10-02).
- Southwestern Eye Center Ltd116 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Prescott
Clinicians with the same Medicare primary specialty in Prescott, AZ — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Pacific University - College Of Optometry |
| Graduation year | 1973 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225094550 |
| 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