Chun Joey Chang, M.D.
NPI 1003015462ActiveIndividual· Emergency Medicine· Modesto, CA
Emergency Medicine (M.D.) in Modesto, California, trained at University of California, Geffen School of Medicine (class of 2006). 586 Medicare patients in 2024, $95,436 paid; nearly all of their 695 Part D prescriptions were generic (96%). Astellas Pharma US Inc was the largest of 4 companies reporting payments in 2025, $73.53 in all, mostly food and beverage.
Overview
| NPI | 1003015462 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 16, 2007 |
| Last updated in NPPES | Sep 6, 2022 |
| Certified by provider | Sep 6, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | A106131 | CA |
| Family Medicine | 207Q00000X | A106131 | CA |
| Physical Medicine & Rehabilitation | 208100000X | 22015 | MD |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Emergency Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 586 |
|---|---|
| Services billed | 1,003 across 38 procedure codes |
| Paid by Medicare | $95,436 |
Part D prescriptions in 2024
| Prescriptions (claims) | 695 · 697 30-day fills |
|---|---|
| Patients | 352 |
| Total drug cost | $7,970 |
| Generic share | 96% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Emergency Medicine |
Medical groups
- Cep America - CaliforniaPomona, CA · 1,292 clinicians
- Gem Medical Group CorporationSouth El Monte, CA · 57 clinicians
- Ignite Emergency Physicians A Medical CorporationVictorville, CA · 45 clinicians
- Anaheim Emergency Medical GroupAnaheim, CA · 21 clinicians
Hospital affiliations
- Ahmc Anaheim Regional Medical CenterAnaheim, CA
- Chino Valley Medical CenterChino, CA
- Montclair Hospital Medical CenterMontclair, CA
- Pomona Valley Hospital Medical CenterPomona, CA
- Providence St Mary Medical CenterApple Valley, CA
Industry payments (Open Payments)
- 2025$73.53 · 4 payments from 4 companies
- 2024$198.36 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astellas Pharma US Inc | $23.78 | 1 |
| Abbott Laboratories | $20.23 | 1 |
| Inari Medical, Inc. | $15.19 | 1 |
| Stryker Corporation | $14.33 | 1 |
What the 2025 payments were for
- Food and Beverage$73.53 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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