Grace H. Chang, M.D.
NPI 1992877625ActiveIndividual· Internal Medicine· Irvine, CA
Opted out of Medicare from April 2026 to April 2028. Internal Medicine (M.D.) in Irvine, California, licensed in CA, with an NPI issued in November 2006. Part D covered 1,574 prescriptions written in 2024, 81% of them generic. Recordati_rare_diseases_inc. was the largest of 4 companies reporting payments in 2025, $423.54 in all, mostly food and beverage.
Overview
| NPI | 1992877625 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Nov 15, 2006 |
| Last updated in NPPES | Apr 11, 2022 |
| Certified by provider | Apr 9, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A61499 | 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Opt-out | Opted out Apr 1, 2026 – Apr 1, 2028 |
| Can order and refer | Yes |
During an opt-out period the provider sees Medicare patients only under private contracts, and Medicare does not pay claims for their services.
Part D prescriptions in 2024
| Prescriptions (claims) | 1,574 · 3,508 30-day fills |
|---|---|
| Patients | 157 |
| Total drug cost | $201,747 |
| Generic share | 81% of claims |
Industry payments (Open Payments)
- 2025$423.54 · 5 payments from 4 companies
- 2024$300.45 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Recordati_rare_diseases_inc. | $131.95 | 1 |
| Novo Nordisk Inc | $124.02 | 1 |
| Exact Sciences Corporation | $119.77 | 1 |
| Otsuka America Pharmaceutical, Inc. | $47.80 | 2 |
What the 2025 payments were for
- Food and Beverage$423.54 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 207 internal medicine physicians in Irvine · All internal medicine physicians in California