Johnny K. Chang, MD
NPI 1366465304ActiveIndividual· Internal Medicine, Hematology & Oncology· Tarzana, CA
Internal Medicine, Hematology & Oncology (MD) in Tarzana, California, trained at University of California, Geffen School of Medicine (class of 1998). In 2024 Medicare paid $3,309,521 for 800 patients, and Part D covered 614 of their prescriptions, 69% of them generic. Lilly USA, LLC was the largest of 4 companies reporting payments in 2025, $153,949 in all, mostly speaking and faculty fees.
Overview
| NPI | 1366465304 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 25, 2006 |
| Last updated in NPPES | Jul 29, 2026 |
| Certified by provider | Jul 29, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A70618 | 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 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 - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 800 |
|---|---|
| Services billed | 203,124 across 130 procedure codes |
| Paid by Medicare | $3,309,521 |
Part D prescriptions in 2024
| Prescriptions (claims) | 614 · 1,027 30-day fills |
|---|---|
| Patients | 147 |
| Total drug cost | $2,536,816 |
| Generic share | 69% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Medical Oncology |
Medical group
- Cedars-Sinai Medical Care FoundationWest Hollywood, CA · 1,692 clinicians
Hospital affiliations
- Cedars-Sinai Medical CenterLos Angeles, CA
- Providence Cedars Sinai Tarzana Medical CenterTarzana, CA
Industry payments (Open Payments)
- 2025$153,949 · 246 payments from 4 companies
- 2024$110,523 · 169 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $101,445 | 171 |
| Abbvie Inc. | $40,466 | 58 |
| Astrazeneca Pharmaceuticals LP | $12,003 | 16 |
| Pfizer Inc. | $35.81 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$123,005 · 51 payments
- Travel and Lodging$24,557 · 123 payments
- Food and Beverage$4,110 · 70 payments
- Consulting Fee$2,278 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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