Quick answers
- Where does Grant W. Knowles see patients?
- Medicare's clinician data lists 3 practice locations, including Monmouth, OR and Dallas, OR. Call before your visit to confirm the address.
- What is Grant W. Knowles's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Grant W. Knowles accept Medicare assignment?
- Yes. Medicare's clinician data says Grant W. Knowles 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 Grant W. Knowles?
- (503) 623-9233, as listed in official Medicare / NPI Registry data.
- What is Grant W. Knowles's NPI number?
- 1710362058. 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 Grant W. Knowles is enrolled with Medicare (CMS data updated 2026-10-02).
- 405 Boyd LnMonmouth, OR 97361
- 506 Main StDallas, OR 97338 (503) 623‑9233
- 636 Clay St WMonmouth, OR 97361
Group practices
Medicare enrollment lists Grant W. Knowles as a member of this group (CMS data updated 2026-10-02).
- Polk Vision Clinics Inc3 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Oregon
Clinicians with the same Medicare primary specialty in Oregon — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Pacific University - College Of Optometry |
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1710362058 |
| 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