William A. Chua, M.D.
NPI 1639199656ActiveIndividual· Internal Medicine, Hematology & Oncology· Montebello, CA
Internal Medicine, Hematology & Oncology (M.D.) with Legacy Marketing Worldwide Inc and 1 other group, practicing in Montebello, California. In 2024 Medicare paid $1,414,813 for 1,647 patients, and Part D covered 2,314 of their prescriptions, 88% of them generic. Gilead Sciences, Inc. was the largest of 5 companies reporting payments in 2025, $593.98 in all, mostly food and beverage.
Overview
| NPI | 1639199656 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 20, 2006 |
| Last updated in NPPES | Jan 25, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A34309 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,647 |
|---|---|
| Services billed | 17,116 across 19 procedure codes |
| Paid by Medicare | $1,414,813 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,314 · 3,125 30-day fills |
|---|---|
| Patients | 163 |
| Total drug cost | $278,934 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 1972 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical groups
- Legacy Marketing Worldwide IncLos Angeles, CA · 5 clinicians
- Perpetual Mobile Medical Group IncLos Angeles, CA · 3 clinicians
Other facilities
- Constellation Home Health Services, LLCHome health agency · Northridge, CA
- Logos Home Health CareHome health agency · Burbank, CA
- Preferred Choice Home Health Care, IncHome health agency · Reseda, CA
- Saint Mariam Home Health Care, IncHome health agency · Los Angeles, CA
- Supreme Home Care Services, Inc.Home health agency · Glendale, CA
- Broadway Healthcare CenterNursing home · San Gabriel, CA
Industry payments (Open Payments)
- 2025$593.98 · 15 payments from 5 companies
- 2024$694.42 · 19 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $256.80 | 2 |
| Bayer Healthcare Pharmaceuticals Inc. | $176.83 | 6 |
| Cranial Technologies, Inc | $85.67 | 4 |
| Incyte Corporation | $52.92 | 2 |
| Merck Sharp & Dohme LLC | $21.76 | 1 |
What the 2025 payments were for
- Food and Beverage$593.98 · 15 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hematology & Oncology providers in Montebello
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All Internal Medicine, Hematology & Oncology providers in California →