William John Shaffer, O.D.
Optometrist · Oxnard, CA
William John Shaffer, O.D. is an optometrist with a practice address in Oxnard, California, and NPI 1457451031, issued on Sep 24, 2006. Check the license (California 5774T, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William John Shaffer
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 5774T CA
Self-reported in NPPES; status is on the state search - Practice location
- 340 S 5TH St, Oxnard, CA 93030
- Phone
- (805) 487-6363
- Enumerated
- Sep 24, 2006
- Record last updated
- May 14, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (805) 486-9698
- Medicaid ID
- SD0057742 CA
- Medicare enrollment
- Enrolled (PECOS I20101022000678); accepts Medicare assignment
- Medical or professional school
- Southern College Of Optometry, 1973
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Verify William John Shaffer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 5774TCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average optometrist in 2024
161 Medicare Part D claims for 41 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 62% of claims.
Most prescribed
- Lumigan60 claims
- Latanoprost42 claims
- Brimonidine Tartrate18 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
William John Shaffer among 8,308 optometrist records in California
William John Shaffer, O.D. is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 66% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated1973 · median 2008 among the 3,573 with a school on file
- Record last updated2008 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in California
There are 8,308 optometrist records in California.
All 8,308 in California → Every provider in Oxnard → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Richard Anderson, O.D.Oxnard, CA 930301578600649
- Mally Azarmipur, O.D.Oxnard, CA 930301467516369
- Barry Braff, ODOxnard, CA 930301982735205
- Karen Garrety, ODOxnard, CA 930301215954706
- Lisa Knapp, O.D.Oxnard, CA 930301700867470
- Mary Liao, O.D.Oxnard, CA 930301992858526
- Lisa Maier, O.D.Oxnard, CA 930301154753770
- Adolfo Murillo, O.D.Oxnard, CA 930301932223914
Common questions
What is William John Shaffer, O.D.'s NPI number?
William John Shaffer, O.D.'s National Provider Identifier (NPI) is 1457451031, issued on Sep 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William John Shaffer, O.D. located?
The NPPES record lists a practice address at 340 S 5TH St, Oxnard, CA, 93030. Phone: (805) 487-6363. Providers update this record themselves, so call before visiting.
How can I verify William John Shaffer, O.D.'s license?
NPPES lists California license number 5774T, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does William John Shaffer, O.D. prescribe under Medicare Part D?
In 2024, William John Shaffer, O.D. had 161 Medicare Part D claims for 41 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.