Brian Ahn, D.O.
NPI 1265849749 · Student in an Organized Health Care Education/Training Program · Chino, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brian Ahn, D.O. is a Student in an Organized Health Care Education/Training Program provider in Chino, CA (NPI 1265849749).
Provider details
- NPI number
- 1265849749
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
11 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 94 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 460 | 164 |
| Lisinopril | 349 | 124 |
| Amlodipine Besylate | 291 | 109 |
| Losartan Potassium | 282 | 98 |
| Metformin Hcl | 223 | 81 |
| Levothyroxine Sodium | 166 | 60 |
| Fluticasone Propionate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-07-17
- Last updated
- 2021-12-16
Frequently asked questions
- What is Brian Ahn's NPI number?
- Brian Ahn's National Provider Identifier (NPI) is 1265849749, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brian Ahn's specialty?
- Brian Ahn is listed in the NPPES registry with a primary specialty of Student in an Organized Health Care Education/Training Program (Student, Health Care).
- Where is Brian Ahn located?
- Brian Ahn's practice location on file with NPPES is 5451 Walnut Ave, Chino, CA 91710-2609.
- What is Brian Ahn's phone number?
- The practice phone number listed in the NPPES registry for Brian Ahn is (909) 464-8600.
- Does Brian Ahn accept Medicare?
- Brian Ahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Brian Ahn's NPI active?
- Yes — Brian Ahn's NPI (1265849749) is active in the NPPES registry as of the last update on 2021-12-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.