Quick answers
- Where does William J. Shaffer see patients?
- Medicare's clinician data lists 1 practice location in Oxnard, CA. Call before your visit to confirm the address.
- What is William J. Shaffer's specialty?
- Medicare lists Optometry as the primary specialty.
- Does William J. Shaffer accept Medicare assignment?
- Yes. Medicare's clinician data says William J. Shaffer 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 J. Shaffer?
- (805) 486-6600, as listed in official Medicare / NPI Registry data.
- What is William J. Shaffer's NPI number?
- 1457451031. 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 William J. Shaffer is enrolled with Medicare (CMS data updated 2026-10-02).
- 340 S 5th StOxnard, CA 93030 (805) 486‑6600
Specialties
- Optometryprimary
Other optometrists in Oxnard
Clinicians with the same Medicare primary specialty in Oxnard, CA — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Southern College Of Optometry |
| Graduation year | 1973 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457451031 |
| 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