Ona Mae Reiko Shiroyama, O.D.
Optometrist · Ventura, CA
Ona Mae Reiko Shiroyama, O.D. is an optometrist with a practice address in Ventura, California, and NPI 1932142841, issued on Jun 14, 2006. Check the license (California 6802T, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ona Mae Reiko Shiroyama
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 6802T CA
Self-reported in NPPES; status is on the state search - Practice location
- 1280 S Victoria Ave, Ventura, CA 93003
- Phone
- (805) 650-9922
- Enumerated
- Jun 14, 2006
- Record last updated
- Jan 11, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (805) 650-6656
- Medicaid ID
- SD0068020 CA
- Medicare enrollment
- Enrolled (PECOS I20090725000121); accepts Medicare assignment
- Medical or professional school
- Illinois College Of Optometry At Chicago, 1979
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 1280 S Victoria Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Paul Bohman, DDSOral and Maxillofacial Surgery (Dentist)1336271170
- Mark Bozek, O.D.Optometrist1649249319
- Katherine Emerick, PH.D.Clinical Psychologist1457476764
- Marzena Gilbert, O.D.Optometrist1245504851
- Judith Holloway, PH.D.Clinical Psychologist1861872160
Verify Ona Mae Reiko Shiroyama in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 6802TCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average optometrist in 2024
25 Medicare Part D claims, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 92% of claims.
Most prescribed
- Restasis12 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.
Bills Medicare through one group practice
- Ventura Optometric Vision Care Inc.Ventura, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ona Mae Reiko Shiroyama among 8,308 optometrist records in California
Ona Mae Reiko Shiroyama, 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
- Graduated1979 · median 2008 among the 3,573 with a school on file
- Record last updated2011 · 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).
51 optometrist records list a practice address in Ventura
They are 51 of the 4,435 NPPES records with a practice address in Ventura, and 8,308 optometrist records in California.
All 8,308 in California → Every provider in Ventura → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Richard Blue, ODVentura, CA 930031366523193
- Michael Boggs, O.D.Ventura, CA 930031447287503
- Mark Bozek, O.D.Ventura, CA 930031649249319
- Mark Brunette, O.D.Ventura, CA 930031538105846
- Dan Clower, O.D.Ventura, CA 930031720015811
- James Deardorff, O.D.Ventura, CA 930031598780611
- John Floryan, O.D.Ventura, CA 930031700853462
- Thomas Funnell, ODVentura, CA 930031851401020
Common questions
What is Ona Mae Reiko Shiroyama, O.D.'s NPI number?
Ona Mae Reiko Shiroyama, O.D.'s National Provider Identifier (NPI) is 1932142841, issued on Jun 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ona Mae Reiko Shiroyama, O.D. located?
The NPPES record lists a practice address at 1280 S Victoria Ave, Ventura, CA, 93003. Phone: (805) 650-9922. Providers update this record themselves, so call before visiting.
How can I verify Ona Mae Reiko Shiroyama, O.D.'s license?
NPPES lists California license number 6802T, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Ona Mae Reiko Shiroyama, O.D. prescribe under Medicare Part D?
In 2024, Ona Mae Reiko Shiroyama, O.D. had 25 Medicare Part D claims; 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.