Roger Christopher Chang, MD, PHD
NPI 1679035216ActiveIndividual· Psychiatry & Neurology, Epilepsy· Palo Alto, CA
Psychiatry & Neurology, Epilepsy (MD, PHD) in Palo Alto, California, licensed in CA, with an NPI issued in April 2019. Their prescriptions cost Medicare Part D more than their services did: $15,090 for 35 claims, against $2,972 paid for services in 2024. Jazz Pharmaceuticals Inc. was the largest of 4 companies reporting payments in 2025, $675.75 in all, mostly food and beverage.
Overview
| NPI | 1679035216 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | Apr 2, 2019 |
| Last updated in NPPES | Jul 4, 2024 |
| Certified by provider | Jul 4, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Epilepsy Primary | 2084E0001X | A186929 | CA |
| Psychiatry & Neurology, Neurology | 2084N0400X | A186929 | 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 18 |
|---|---|
| Services billed | 23 across 7 procedure codes |
| Paid by Medicare | $2,972 |
Part D prescriptions in 2024
| Prescriptions (claims) | 35 · 55 30-day fills |
|---|---|
| Patients | 13 |
| Total drug cost | $15,090 |
| Generic share | 83% of claims |
Industry payments (Open Payments)
- 2025$675.75 · 8 payments from 4 companies
- 2024$130.95 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Jazz Pharmaceuticals Inc. | $329.44 | 4 |
| Livanova USA, Inc. | $135.55 | 1 |
| Sk Life Science, Inc. | $108.91 | 2 |
| Lundbeck LLC | $101.85 | 1 |
What the 2025 payments were for
- Food and Beverage$675.75 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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