Gene-Yuan Chang, MD
NPI 1467731828ActiveIndividual· Internal Medicine, Nephrology· Castro Valley, CA
Internal Medicine, Nephrology (MD) in Castro Valley, California, trained at Boston University School of Medicine (class of 2009). Their prescriptions cost Medicare Part D more than their services did: $681,196 for 2,018 claims, against $241,178 paid for services in 2024. Novo Nordisk Inc was the largest of 9 companies reporting payments in 2025, $839.68 in all, mostly food and beverage.
Overview
| NPI | 1467731828 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 16, 2011 |
| Last updated in NPPES | Apr 25, 2025 |
| Certified by provider | Apr 25, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 121677 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 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 | 436 |
|---|---|
| Services billed | 2,065 across 31 procedure codes |
| Paid by Medicare | $241,178 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,018 · 4,153 30-day fills |
|---|---|
| Patients | 202 |
| Total drug cost | $681,196 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | Boston University School of Medicine |
|---|---|
| Graduation year | 2009 |
| Medicare specialty | Nephrology |
| Telehealth | Offers telehealth |
Medical group
- West Coast KidneyDaly City, CA · 56 clinicians
Hospital affiliations
- Alta Bates Summit Medical CenterOakland, CA
- Eden Medical CenterCastro Valley, CA
- Highland HospitalOakland, CA
Other facilities
- Davita Castro ValleyDialysis facility · Castro Valley, CA
- Davita Hayward Dialysis CenterDialysis facility · Hayward, CA
- Davita San Leandro DialysisDialysis facility · San Leandro, CA
Industry payments (Open Payments)
- 2025$839.68 · 31 payments from 9 companies
- 2024$710.93 · 30 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $183.87 | 3 |
| Amgen Inc. | $144.61 | 9 |
| Fresenius USA Marketing, Inc. | $138.29 | 7 |
| Ardelyx, Inc. | $119.72 | 1 |
| Mallinckrodt Hospital Products Inc. | $91.40 | 4 |
What the 2025 payments were for
- Food and Beverage$839.68 · 31 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other nephrologists in Castro Valley
- 1740243930
- 1740476761
- 1295363752