Quick answers
- Which hospitals does William R. Knapp work at?
- Medicare's official clinician data lists William R. Knapp at 1 hospital: Wyandot Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William R. Knapp see patients?
- Medicare's clinician data lists 1 practice location in Upper Sandusky, OH. Call before your visit to confirm the address.
- What is William R. Knapp's specialty?
- Medicare lists Optometry as the primary specialty.
- Does William R. Knapp accept Medicare assignment?
- Yes. Medicare's clinician data says William R. Knapp 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 William R. Knapp?
- (419) 294-2421, as listed in official Medicare / NPI Registry data.
- What is William R. Knapp's NPI number?
- 1437131927. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William R. Knapp works
Medicare's Facility Affiliation Data lists William R. Knapp at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Wyandot Memorial HospitalUpper Sandusky, OH · Critical Access Hospital · CCN 361329
Practice locations
Addresses where William R. Knapp is enrolled with Medicare (CMS data updated 2026-10-02).
- 212 E Wyandot AveUpper Sandusky, OH 43351 (419) 294‑2421
Specialties
- Optometryprimary
Other optometrists in Upper Sandusky
Clinicians with the same Medicare primary specialty in Upper Sandusky, OH — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Ohio State University - College Of Optometry |
| Graduation year | 1996 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437131927 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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