Kook I. Chang, M.D.
NPI 1356442354ActiveIndividual· Internal Medicine· Van Nuys, CA
Internal Medicine (M.D.) in Van Nuys, California, licensed in CA, with an NPI issued in September 2006. Their prescriptions cost Medicare Part D more than their services did: $1,593,740 for 10,757 claims, against $69,860 paid for services in 2024. Abbvie Inc. was the largest of 12 companies reporting payments in 2025, $1,164 in all, mostly food and beverage.
Overview
| NPI | 1356442354 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Sep 25, 2006 |
| Last updated in NPPES | May 16, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A 40580 | 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) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 174 |
|---|---|
| Services billed | 1,175 across 13 procedure codes |
| Paid by Medicare | $69,860 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,757 · 19,856 30-day fills |
|---|---|
| Patients | 351 |
| Total drug cost | $1,593,740 |
| Generic share | 81% of claims |
Education and affiliations
| Graduation year | 1967 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Cardiac Surgery, Cardiovascular Disease (Cardiology) |
| Telehealth | Offers telehealth |
Industry payments (Open Payments)
- 2025$1,164 · 32 payments from 12 companies
- 2024$787.22 · 18 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $171.49 | 7 |
| Phathom Pharmaceuticals, Inc. | $159.80 | 2 |
| Glaxosmithkline, LLC. | $151.47 | 3 |
| Aimmune Therapeutics, Inc. | $147.99 | 5 |
| E.R. Squibb & Sons, L.L.C. | $117.66 | 1 |
What the 2025 payments were for
- Food and Beverage$1,164 · 32 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 75 internal medicine physicians in Van Nuys · All internal medicine physicians in California