Yongen Chang, MD, PHD
NPI 1932490034ActiveIndividual· Internal Medicine, Nephrology· Orange, CA
Internal Medicine, Nephrology (MD, PHD) with Uc Regents, practicing in Orange, California. In 2024 Medicare paid $32,247 for 44 patients, and Part D covered 111 of their prescriptions, 87% of them generic. Otsuka Pharmaceutical Development & Commercialization, Inc. was the largest of 9 companies reporting payments in 2025, $31,730 in all, mostly consulting fees. Lists Uci Health-Orange as a hospital affiliation.
Overview
| NPI | 1932490034 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | Apr 22, 2011 |
| Last updated in NPPES | Sep 27, 2024 |
| Certified by provider | Sep 27, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A115410 | CA |
| Specialist | 174400000X | A115410 | CA |
| Internal Medicine | 207R00000X | A115410 | 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 - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 44 |
|---|---|
| Services billed | 137 across 11 procedure codes |
| Paid by Medicare | $32,247 |
Part D prescriptions in 2024
| Prescriptions (claims) | 111 · 230 30-day fills |
|---|---|
| Patients | 27 |
| Total drug cost | $39,706 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Uc RegentsOrange, CA · 319 clinicians
Hospital affiliation
- Uci Health-OrangeOrange, CA
Other facilities
- Fmc-University Dialysis Center of OrangeDialysis facility · Orange, CA
Industry payments (Open Payments)
- 2025$31,730 · 67 payments from 9 companies
- 2024$12,571 · 17 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Otsuka Pharmaceutical Development & Commercialization, Inc. | $14,834 | 27 |
| Travere Therapeutics, Inc. | $11,001 | 22 |
| Amgen Inc. | $3,530 | 4 |
| Calliditas Therapeutics US Inc. | $2,183 | 7 |
| Novartis Pharmaceuticals Corporation | $51.38 | 2 |
What the 2025 payments were for
- Consulting Fee$26,028 · 10 payments
- Travel and Lodging$3,738 · 20 payments
- Food and Beverage$1,965 · 37 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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