Isabel K. Cheon, M. D.
NPI 1033425459ActiveIndividual· Internal Medicine· San Diego, CA
Opted out of Medicare from October 2026 to October 2028. Internal Medicine (M. D.) in San Diego, California, trained at University of Southern California Keck School of Medicine (class of 2010). Their prescriptions cost Medicare Part D more than their services did: $276,826 for 4,866 claims, against $161,311 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. reported $20.85 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1033425459 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M. D. |
| Sole proprietor | No |
| NPI issued | Aug 23, 2010 |
| Last updated in NPPES | Aug 24, 2026 |
| Certified by provider | Aug 24, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A120346 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Opt-out | Opted out Oct 1, 2026 – Oct 1, 2028 |
| Can order and refer | Yes |
| Accepts assignment | Yes (participating) |
During an opt-out period the provider sees Medicare patients only under private contracts, and Medicare does not pay claims for their services.
Medicare services in 2024
| Medicare patients | 466 |
|---|---|
| Services billed | 5,954 across 29 procedure codes |
| Paid by Medicare | $161,311 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,866 · 11,563 30-day fills |
|---|---|
| Patients | 509 |
| Total drug cost | $276,826 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 2010 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Scripps Green HospitalLa Jolla, CA
- Scripps Memorial Hospital la JollaLa Jolla, CA
- Scripps Mercy HospitalSan Diego, CA
Other facilities
- Seaport Scripps Home HealthHome health agency · San Diego, CA
Industry payments (Open Payments)
- 2025$20.85 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $20.85 | 1 |
What the 2025 payments were for
- Food and Beverage$20.85 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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