Brian Ahn, D.O.
Student in an Organized Health Care Education/Training Program · Chino, CA
Brian Ahn, D.O. is a student in an organized health care education/training program with a practice address in Chino, California, and NPI 1265849749, issued on Jul 17, 2014. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Brian Ahn
- Credential
- D.O.
- Primary taxonomy
- Student in an Organized Health Care Education/Training Program 390200000X
- Practice location
- 5451 Walnut Ave, Chino, CA 91710
- Phone
- (909) 464-8600
- Enumerated
- Jul 17, 2014
- Record last updated
- Dec 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170517000902); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest student in an organized health care education/training program records → All 40,652 in California → Look up another NPI →
Also registered at 5451 Walnut Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashraf Abdel-KerimEmergency Medicine Physician1396961538
- Udhaya AeletyFamily Medicine Physician1740815943
- Ahmet AhmadiStudent in an Organized Health Care Education/Training Program1043199532
- Randall Allred, D.O.Student in an Organized Health Care Education/Training Program1629427703
- Harikrishna Ambati, MDFamily Medicine Physician1154998730
- Mereat Askander, DPMStudent in an Organized Health Care Education/Training Program1093567836
Verify Brian Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
34.0 times the Medicare Part D claims of the average student in an organized health care education/training program in 2024
6,293 Medicare Part D claims for 695 beneficiaries, against an average of 185 among the 59,748 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 176 claims were for opioids.
Most prescribed
- Atorvastatin Calcium460 claims
- Lisinopril349 claims
- Amlodipine Besylate291 claims
- Losartan Potassium282 claims
- Metformin Hcl223 claims
- Levothyroxine Sodium166 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.
Bills Medicare through one group practice
- Permanente Medical Group IncFresno, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian Ahn among 40,652 student in an organized health care education/training program records in California
Brian Ahn, D.O. is one of 40,652 student in an organized health care education/training program records with a practice address in California. 16% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 9% of them.
- NPI issued2014 · 9% of these records are older, 89% newer
- In a Medicare fileYes · 16% of these records are
- In the CMS Doctors and Clinicians fileYes · 6% of these records are
- Graduated2014 · median 2017 among the 2,409 with a school on file
- Record last updated2021 · 26% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 390200000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
69 student in an organized health care education/training program records list a practice address in Chino
They are 69 of the 1,097 NPPES records with a practice address in Chino, and 40,652 student in an organized health care education/training program records in California.
All 40,652 in California → Every provider in Chino → Student in an Organized Health Care Education/Training Program nationwide →
The 8 student in an organized health care education/training program records with the nearest ZIP codes
- Randall Allred, D.O.Chino, CA 917101629427703
- Andrew AttiaChino, CA 917101255906285
- Anita Aynehchi, DOChino, CA 917101962930412
- Karen CanoChino, CA 917101417590464
- Donell GriffinChino, CA 917101396105615
- Azher JameelChino, CA 917101740843390
- Cagney JohnsonChino, CA 917101073271532
- Shruti Katbamna, MDChino, CA 917101194253708
Common questions
What is Brian Ahn, D.O.'s NPI number?
Brian Ahn, D.O.'s National Provider Identifier (NPI) is 1265849749, issued on Jul 17, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Brian Ahn, D.O. located?
The NPPES record lists a practice address at 5451 Walnut Ave, Chino, CA, 91710. Phone: (909) 464-8600. Providers update this record themselves, so call before visiting.
How can I verify Brian Ahn, D.O.'s license?
Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Brian Ahn, D.O. prescribe under Medicare Part D?
In 2024, Brian Ahn, D.O. had 6,293 Medicare Part D claims for 695 beneficiaries; the average among student in an organized health care education/training program prescribers was 185. 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.