Diana Juhee Chang
NPI 1396142386ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Ventura, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism in Ventura, California, trained at University of California, Davis School of Medicine (class of 2016). Their prescriptions cost Medicare Part D more than their services did: $1,325,533 for 2,558 claims, against $161,723 paid for services in 2024. Stryker Corporation was the largest of 2 companies reporting payments in 2025, $1,426 in all, mostly travel and lodging.
Overview
| NPI | 1396142386 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | Yes |
| NPI issued | Nov 19, 2014 |
| Last updated in NPPES | Jul 8, 2021 |
| Certified by provider | Jul 8, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A154454 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 292 |
|---|---|
| Services billed | 7,318 across 26 procedure codes |
| Paid by Medicare | $161,723 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,558 · 5,525 30-day fills |
|---|---|
| Patients | 348 |
| Total drug cost | $1,325,533 |
| Generic share | 42% of claims |
Education and affiliations
| Medical school | University of California, Davis School of Medicine |
|---|---|
| Graduation year | 2016 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- The Regents of the University of CaliforniaSanta Monica, CA · 1,462 clinicians
Hospital affiliations
- Ronald Reagan UCLA Medical CenterLos Angeles, CA
- Santa Monica - UCLA Med Ctr & Orthopaedic HospitalSanta Monica, CA
- UCLA West Valley Medical CenterWest Hills, CA
Industry payments (Open Payments)
- 2025$1,426 · 5 payments from 2 companies
- 2024$47.27 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Stryker Corporation | $1,407 | 4 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $18.85 | 1 |
What the 2025 payments were for
- Travel and Lodging$1,407 · 4 payments
- Education$18.85 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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