William Yow Jung Chang, MD
NPI 1003236688ActiveIndividual· Internal Medicine, Critical Care Medicine· Monterey Park, CA
Internal Medicine, Critical Care Medicine (MD) in Monterey Park, California, trained at Albany Medical College of Union University (class of 2014). Their prescriptions cost Medicare Part D more than their services did: $1,193,940 for 1,996 claims, against $420,614 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 14 companies reporting payments in 2025, $2,110 in all, mostly food and beverage.
Overview
| NPI | 1003236688 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 22, 2014 |
| Last updated in NPPES | Aug 18, 2021 |
| Certified by provider | Aug 18, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Critical Care Medicine Primary | 207RC0200X | A140305 | CA |
| Internal Medicine, Pulmonary Disease | 207RP1001X | A140305 | 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 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 - Critical Care (Intensivists) (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 801 |
|---|---|
| Services billed | 4,058 across 41 procedure codes |
| Paid by Medicare | $420,614 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,996 · 2,700 30-day fills |
|---|---|
| Patients | 296 |
| Total drug cost | $1,193,940 |
| Generic share | 36% of claims |
Education and affiliations
| Medical school | Albany Medical College of Union University |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Critical Care (Intensivists) |
| Secondary specialties | Pulmonary Disease |
| Telehealth | Offers telehealth |
Medical group
- Prestige Pulmonary Consultants IncMonterey Park, CA · 11 clinicians
Hospital affiliations
- Adventist Health White MemorialLos Angeles, CA
- Alhambra Hospital Medical CenterAlhambra, CA
- Garfield Medical CenterMonterey Park, CA
- San Gabriel Valley Medical CenterSan Gabriel, CA
- Usc Arcadia HospitalArcadia, CA
Other facilities
- Premium Home Health, IncHome health agency · Norwalk, CA
- Premium Hospice, Inc.Hospice · Norwalk, CA
Industry payments (Open Payments)
- 2025$2,110 · 98 payments from 14 companies
- 2024$1,941 · 70 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $708.42 | 28 |
| Glaxosmithkline, LLC. | $432.76 | 20 |
| Verona Pharma, Inc. | $234.69 | 9 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $143.50 | 13 |
| Actelion Pharmaceuticals US, Inc. | $102.36 | 2 |
What the 2025 payments were for
- Food and Beverage$2,110 · 98 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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