Ian Chang, D.O.
NPI 1407116411ActiveIndividual· Internal Medicine, Rheumatology· Orange, CA
Internal Medicine, Rheumatology (D.O.) in Orange, California, licensed in CA and MI, with an NPI issued in May 2012. Their prescriptions cost Medicare Part D more than their services did: $532,818 for 361 claims, against $27,730 paid for services in 2024.
Overview
| NPI | 1407116411 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | May 23, 2012 |
| Last updated in NPPES | Mar 29, 2023 |
| Certified by provider | Mar 29, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | 20A16850 | CA |
| Internal Medicine | 207R00000X | 5101019682 | MI |
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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 118 |
|---|---|
| Services billed | 378 across 13 procedure codes |
| Paid by Medicare | $27,730 |
Part D prescriptions in 2024
| Prescriptions (claims) | 361 · 651 30-day fills |
|---|---|
| Patients | 78 |
| Total drug cost | $532,818 |
| Generic share | 76% of claims |
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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