Stephen Ou, MD
NPI 1669763439 · Student in an Organized Health Care Education/Training Program · Diamond Bar, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Ou, MD is a Student in an Organized Health Care Education/Training Program provider in Diamond Bar, CA (NPI 1669763439).
Provider details
- NPI number
- 1669763439
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
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
15 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 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 256 | 83 |
| Alendronate Sodium | 167 | 57 |
| Methimazole | 91 | 35 |
| Teriparatidebrand: Forteo | 58 | — |
| Semaglutidebrand: Ozempic | 50 | — |
| Testosterone | 46 | 16 |
| Hydrocortisone | 37 | 14 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-04-27
- Last updated
- 2021-12-06
- Certified
- 2021-12-06
Frequently asked questions
- What is Stephen Ou's NPI number?
- Stephen Ou's National Provider Identifier (NPI) is 1669763439, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Ou's specialty?
- Stephen Ou 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 Stephen Ou located?
- Stephen Ou's practice location on file with NPPES is 2582 Steeplechase Ln, Diamond Bar, CA 91765-3621.
- What is Stephen Ou's phone number?
- The practice phone number listed in the NPPES registry for Stephen Ou is (909) 612-4390.
- Does Stephen Ou accept Medicare?
- Stephen Ou is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Ou's NPI active?
- Yes — Stephen Ou's NPI (1669763439) is active in the NPPES registry as of the last update on 2021-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.