Mary Chung-Ning Duong, PAC
NPI 1386607638ActiveIndividual· Physician Assistant· Los Angeles, CA
Physician Assistant (PAC) with Providence Saint Johns Medical Foundation, practicing in Los Angeles, California. Their prescriptions cost Medicare Part D more than their services did: $1,946,079 for 428 claims, against $4,392 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 6 companies reporting payments in 2025, $2,065 in all, mostly consulting fees. Lists Cedars-Sinai Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1386607638 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PAC |
| Sole proprietor | No |
| NPI issued | Apr 8, 2006 |
| Last updated in NPPES | Jul 7, 2021 |
| Certified by provider | Jul 7, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA15424 | CA |
| Clinical Nurse Specialist, Oncology | 364SX0200X | PA15424 | 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 - Physician Assistant (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 30 |
|---|---|
| Services billed | 194 across 16 procedure codes |
| Paid by Medicare | $4,392 |
Part D prescriptions in 2024
| Prescriptions (claims) | 428 · 550 30-day fills |
|---|---|
| Patients | 45 |
| Total drug cost | $1,946,079 |
| Generic share | 60% of claims |
Education and affiliations
| Graduation year | 2000 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Providence Saint Johns Medical FoundationSanta Monica, CA · 281 clinicians
Hospital affiliations
- Cedars-Sinai Medical CenterLos Angeles, CA
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
- Saint John's Health CenterSanta Monica, CA
Industry payments (Open Payments)
- 2025$2,065 · 19 payments from 6 companies
- 2024$1,358 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $1,325 | 4 |
| Pfizer Inc. | $363.50 | 6 |
| Janssen Biotech, Inc. | $194.76 | 5 |
| Seagen Inc. | $99.00 | 1 |
| Merck Sharp & Dohme LLC | $61.63 | 2 |
What the 2025 payments were for
- Consulting Fee$1,325 · 4 payments
- Food and Beverage$641.19 · 14 payments
- Education$99.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other physician assistants in Los Angeles
- 1003381971
- 1003459850
- 1013444959
- 1033577556
- 1043689748
- 1063022937
- 1063038107
- 1073140315
- 1073978573
- 1083148811
- 1093119208
- 1104000595
All 951 physician assistants in Los Angeles · All physician assistants in California