Jason Yu-Shen Chang, MBBS
NPI 1457811853ActiveIndividual· Internal Medicine· Stanford, CA
Internal Medicine (MBBS) with Stanford Health Care, practicing in Stanford, California. 122 Medicare patients in 2024, $55,244 paid; nearly all of their 140 Part D prescriptions were generic (91%). Lists Stanford Health Care as a hospital affiliation.
Overview
| NPI | 1457811853 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MBBS |
| Sole proprietor | No |
| NPI issued | Mar 21, 2019 |
| Last updated in NPPES | Apr 18, 2024 |
| Certified by provider | Apr 18, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A177994 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 122 |
|---|---|
| Services billed | 531 across 8 procedure codes |
| Paid by Medicare | $55,244 |
Part D prescriptions in 2024
| Prescriptions (claims) | 140 · 172 30-day fills |
|---|---|
| Patients | 52 |
| Total drug cost | $7,330 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 2013 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 394 internal medicine physicians in Stanford · All internal medicine physicians in California