Allen Onizuka, MD
Internal Medicine Physician · Baldwin Park, CA
Allen Onizuka, MD is an internal medicine physician with a practice address in Baldwin Park, California, and NPI 1811258940, issued on Jun 5, 2012. Check the license (California A124965, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allen Onizuka
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A124965 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1011 Baldwin Park Blvd, Baldwin Park, CA 91706
- Phone
- (626) 851-1011
- Enumerated
- Jun 5, 2012
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1011 Baldwin Park Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Julia Aburto-Erazo, NPNurse Practitioner1922175777
- Mauricio Acevedo, MDInternal Medicine Physician1659442614
- Helen Achio, PHARM.D.Pharmacist1225114614
- Olufemi Adenuga, M.D, MPHPulmonary Disease Physician1134389125
- Soma Agarwal, MDOphthalmology Physician1437220316
Verify Allen Onizuka in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A124965Check 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 internal medicine physician in 2024
349 Medicare Part D claims for 129 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Furosemide25 claims
- Amlodipine Besylate18 claims
- Potassium Chloride15 claims
- Cefpodoxime Proxetil14 claims
- Prednisone14 claims
- Atorvastatin Calcium12 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.
Allen Onizuka among 17,696 internal medicine physician records in California
Allen Onizuka, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
56 internal medicine physician records list a practice address in Baldwin Park
They are 56 of the 1,055 NPPES records with a practice address in Baldwin Park, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Baldwin Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- John Bigley, MDBaldwin Park, CA 917061447321328
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- Victoria Chen, M.D.Baldwin Park, CA 917061760423016
- Robert Clements, MDBaldwin Park, CA 917061326119207
- Daisy Lynn Galario, M.D.Baldwin Park, CA 917061235174129
- Carolyn Hardy, MDBaldwin Park, CA 917061043381973
- Susan Hua, MDBaldwin Park, CA 917061235200213
- Sandra Koyama, MDBaldwin Park, CA 917061548331507
Common questions
What is Allen Onizuka, MD's NPI number?
Allen Onizuka, MD's National Provider Identifier (NPI) is 1811258940, issued on Jun 5, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Allen Onizuka, MD located?
The NPPES record lists a practice address at 1011 Baldwin Park Blvd, Baldwin Park, CA, 91706. Phone: (626) 851-1011. Providers update this record themselves, so call before visiting.
How can I verify Allen Onizuka, MD's license?
NPPES lists California license number A124965, 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 Allen Onizuka, MD prescribe under Medicare Part D?
In 2024, Allen Onizuka, MD had 349 Medicare Part D claims for 129 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.