Gary Allan Osias, O.D.
Optometrist · Castro Valley, CA
Gary Allan Osias, O.D. is an optometrist with a practice address in Castro Valley, California, and NPI 1639230923, issued on Dec 12, 2006. Check the license (California 07027T, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Gary Allan Osias
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 07027T CA
Self-reported in NPPES; status is on the state search - Practice location
- 2687 Castro Valley Blvd, Castro Valley, CA 94546
- Phone
- (510) 581-1553
- Enumerated
- Dec 12, 2006
- Record last updated
- Jun 3, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (510) 581-1929
- Medicaid ID
- GSD000960 CA
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 2687 Castro Valley Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marc Dea, ODOptometrist1174592646
- Stella Levin, O.D.Optometrist1235197138
Verify Gary Allan Osias in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 07027TCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Gary Allan Osias among 8,308 optometrist records in California
Gary Allan Osias, 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 not. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 66% newer
- In a Medicare fileNo · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 43% of these records are
- Record last updated2015 · 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).
24 optometrist records list a practice address in Castro Valley
They are 24 of the 999 NPPES records with a practice address in Castro Valley, and 8,308 optometrist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 8,308 in California → Every provider in Castro Valley → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Christina Atkinson, O.D.Castro Valley, CA 945461619981792
- Marc Dea, ODCastro Valley, CA 945461174592646
- Sampson Fong, O. D.Castro Valley, CA 945461396861522
- Stella Levin, O.D.Castro Valley, CA 945461235197138
- Yuanbing Liao, O.D.Castro Valley, CA 945461497060875
- John LiuCastro Valley, CA 945461114949419
- Kaiyun Mai, O.D.Castro Valley, CA 945461730436643
- John Nelson, O.D.Castro Valley, CA 945461922095082
Common questions
What is Gary Allan Osias, O.D.'s NPI number?
Gary Allan Osias, O.D.'s National Provider Identifier (NPI) is 1639230923, issued on Dec 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary Allan Osias, O.D. located?
The NPPES record lists a practice address at 2687 Castro Valley Blvd, Castro Valley, CA, 94546. Phone: (510) 581-1553. Providers update this record themselves, so call before visiting.
How can I verify Gary Allan Osias, O.D.'s license?
NPPES lists California license number 07027T, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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. 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.