Ilsong Jason Chong, M.D.
NPI 1831240159ActiveIndividual· Internal Medicine, Geriatric Medicine· Oceanside, CA
Internal Medicine, Geriatric Medicine (M.D.) in Oceanside, California, trained at University of Texas Medical School at Houston (class of 1992). Their prescriptions cost Medicare Part D more than their services did: $464,985 for 3,823 claims, against $975.54 paid for services in 2024. Abbvie Inc. was the largest of 4 companies reporting payments in 2025, $75.81 in all, mostly food and beverage.
Overview
| NPI | 1831240159 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 15, 2007 |
| Last updated in NPPES | Mar 17, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | C152937 | CA |
| Internal Medicine, Geriatric Medicine | 207RG0300X | K4025 | TX |
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 | 53 |
|---|---|
| Services billed | 108 across 11 procedure codes |
| Paid by Medicare | $975.54 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,823 · 9,072 30-day fills |
|---|---|
| Patients | 353 |
| Total drug cost | $464,985 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at Houston |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Internal Medicine |
Medical group
- North County Health Project IncSan Marcos, CA · 64 clinicians
Hospital affiliation
- Tri-City Medical CenterOceanside, CA
Industry payments (Open Payments)
- 2025$75.81 · 4 payments from 4 companies
- 2024$277.07 · 14 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $28.24 | 1 |
| Bsn Medical Inc | $16.86 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $16.40 | 1 |
| Lilly USA, LLC | $14.31 | 1 |
What the 2025 payments were for
- Food and Beverage$75.81 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other geriatricians in Oceanside
- 1114904422
- 1619940095