Toshi Hiraoka, M.D.
Emergency Medicine Physician · Fairfield, CA
Toshi Hiraoka, M.D. is an emergency medicine physician with a practice address in Fairfield, California, and NPI 1467489427, issued on Jun 27, 2006. Check the license (California A75512, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Toshi Hiraoka
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A75512 CA
Self-reported in NPPES; status is on the state search - Practice location
- Northbay Medical Center - Fairfield, Fairfield, CA 94533
- Phone
- (707) 429-3600
- Enumerated
- Jun 27, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00A755120 CA
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at Northbay Medical Center - Fairfield
A shared address usually means a shared clinic or building; it does not show who employs whom.
- William Ankney, M.D.Emergency Medicine Physician1760419824
- David Dennis, M.D.Emergency Medicine Physician1730116799
Verify Toshi Hiraoka in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A75512Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average emergency medicine physician in 2024
103 Medicare Part D claims for 66 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 12 claims were for opioids.
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.
Toshi Hiraoka among 7,751 emergency medicine physician records in California
Toshi Hiraoka, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Fairfield → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- William Ankney, M.D.Fairfield, CA 945331760419824
- David Dennis, M.D.Fairfield, CA 945331730116799
- Caesar Djavaherian, M.D.Fairfield, CA 945331790760551
- David Ehrenfeld, M.D.Fairfield, CA 945331417051830
- Steven Garcia, MDFairfield, CA 945331376868323
- Julie Hersk, M.D.Fairfield, CA 945331023114030
- Gary Hollinger, PA-CFairfield, CA 945331598868705
- Kyle Holmes, M.D.Fairfeild, CA 945331386671832
Common questions
What is Toshi Hiraoka, M.D.'s NPI number?
Toshi Hiraoka, M.D.'s National Provider Identifier (NPI) is 1467489427, issued on Jun 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Toshi Hiraoka, M.D. located?
The NPPES record lists a practice address at Northbay Medical Center - Fairfield, Fairfield, CA, 94533. Phone: (707) 429-3600. Providers update this record themselves, so call before visiting.
How can I verify Toshi Hiraoka, M.D.'s license?
NPPES lists California license number A75512, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Toshi Hiraoka, M.D. prescribe under Medicare Part D?
In 2024, Toshi Hiraoka, M.D. had 103 Medicare Part D claims for 66 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.