Eric Okamoto, M.D.
Specialist · Fremont, CA
Eric Okamoto, M.D. is a specialist with a practice address in Fremont, California, and NPI 1588787097, issued on Apr 9, 2007. Check the license (California A25484, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Eric Okamoto
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- A25484 CA
Self-reported in NPPES; status is on the state search - Practice location
- 686 Mowry Ave, Fremont, CA 94536
- Phone
- (510) 794-4640
- Enumerated
- Apr 9, 2007
- Record last updated
- Jul 21, 2022
- Fax
- (510) 794-4640
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 686 Mowry Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Eric Okamoto in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license A25484Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average specialist in 2024
45 Medicare Part D claims for 11 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D.
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.
Eric Okamoto among 5,749 specialist records in California
Eric Okamoto, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 44% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2022 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in Fremont → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Floresita Puth, LEFremont, CA 945361184565608
- Gina YamsuanFremont, CA 945361689985236
- Rey Alba, M.D.Travis Afb, CA 945351316166762
- Michael Bastasch, MDFremont, CA 945381912962028
- Jye-Shern Cheng, M.D.Fremont, CA 945381598729287
- Tristan Dalisay, PTFairfield, CA 945341407008634
- Stefan Haller, M.D.Fremont, CA 945381841232337
- Ciara HannaFairfield, CA 945341477180511
Common questions
What is Eric Okamoto, M.D.'s NPI number?
Eric Okamoto, M.D.'s National Provider Identifier (NPI) is 1588787097, issued on Apr 9, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Eric Okamoto, M.D. located?
The NPPES record lists a practice address at 686 Mowry Ave, Fremont, CA, 94536. Phone: (510) 794-4640. Providers update this record themselves, so call before visiting.
How can I verify Eric Okamoto, M.D.'s license?
NPPES lists California license number A25484, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Eric Okamoto, M.D. prescribe under Medicare Part D?
In 2024, Eric Okamoto, M.D. had 45 Medicare Part D claims for 11 beneficiaries; the average among specialist prescribers was 1,380. 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.