Stuart Koizumi, PHARM.D.
Pharmacist · Norwalk, CA
Stuart Koizumi, PHARM.D. is a pharmacist with a practice address in Norwalk, California, and NPI 1063796233, issued on Oct 5, 2011. Check the license (California RPH53507, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Stuart Koizumi
- Credential
- PHARM.D.
- Primary taxonomy
- Pharmacist 183500000X
- License number
- RPH53507 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10968 Rosecrans Ave., Norwalk, CA 90650
- Phone
- (562) 462-9256
- Enumerated
- Oct 5, 2011
- Record last updated
- Oct 5, 2011 (not updated in 15 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 32,533 in California → Look up another NPI →
Verify Stuart Koizumi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license RPH53507Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average pharmacist in 2024
13 Medicare Part D claims for 13 beneficiaries, against an average of 119 among the 28,524 providers of this specialty who prescribed in Part D. Brand-name drugs were 100% of 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.
Stuart Koizumi among 32,533 pharmacist records in California
Stuart Koizumi, PHARM.D. is one of 32,533 pharmacist records with a practice address in California. 15% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 18% of them.
- NPI issued2011 · 18% of these records are older, 72% newer
- In a Medicare fileYes · 15% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2011 · 76% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 183500000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
67 pharmacist records list a practice address in Norwalk
They are 67 of the 1,600 NPPES records with a practice address in Norwalk, and 32,533 pharmacist records in California.
All 32,533 in California → Every provider in Norwalk → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Susana CuanNorwalk, CA 906501770869075
- William Diamant, PHARM.D.Norwalk, CA 906501033491568
- Anand JethvaNorwalk, CA 906501285850800
- Michael KamNorwalk, CA 906501528346350
- Melanie MaNorwalk, CA 906501548581259
- Tuyet-Nga Nguyen, RPHNorwalk, CA 906501538437439
- Ifeyinwa OkekeNorwalk, CA 906501811279979
- Kevin Park, PHARM.D.Norwalk, CA 906501538456710
Common questions
What is Stuart Koizumi, PHARM.D.'s NPI number?
Stuart Koizumi, PHARM.D.'s National Provider Identifier (NPI) is 1063796233, issued on Oct 5, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Stuart Koizumi, PHARM.D. located?
The NPPES record lists a practice address at 10968 Rosecrans Ave., Norwalk, CA, 90650. Phone: (562) 462-9256. Providers update this record themselves, so call before visiting.
How can I verify Stuart Koizumi, PHARM.D.'s license?
NPPES lists California license number RPH53507, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Stuart Koizumi, PHARM.D. prescribe under Medicare Part D?
In 2024, Stuart Koizumi, PHARM.D. had 13 Medicare Part D claims for 13 beneficiaries; the average among pharmacist prescribers was 119. 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.