Kyu D. Ahn, M.D.
NPI 1427015593ActiveIndividual· Internal Medicine· Pomona, CA
Internal Medicine (M.D.) in Pomona, California, licensed in CA, with an NPI issued in May 2006. Their prescriptions cost Medicare Part D more than their services did: $1,104,679 for 12,076 claims, against $62,144 paid for services in 2024. Penumbra, Inc. was the largest of 3 companies reporting payments in 2025, $215.00 in all, mostly food and beverage. Lists Casa Colina Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1427015593 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 1, 2006 |
| Last updated in NPPES | May 30, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A35299 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 153 |
|---|---|
| Services billed | 991 across 20 procedure codes |
| Paid by Medicare | $62,144 |
Part D prescriptions in 2024
| Prescriptions (claims) | 12,076 · 24,855 30-day fills |
|---|---|
| Patients | 569 |
| Total drug cost | $1,104,679 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1977 |
|---|---|
| Medicare specialty | Internal Medicine |
Hospital affiliations
- Casa Colina HospitalPomona, CA
- Pomona Valley Hospital Medical CenterPomona, CA
Other facilities
- Brio Home Health Services, IncHome health agency · Chino, CA
Industry payments (Open Payments)
- 2025$215.00 · 3 payments from 3 companies
- 2024$226.08 · 10 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Penumbra, Inc. | $170.43 | 1 |
| Aimmune Therapeutics, Inc. | $25.16 | 1 |
| Pfizer Inc. | $19.41 | 1 |
What the 2025 payments were for
- Food and Beverage$215.00 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 58 internal medicine physicians in Pomona · All internal medicine physicians in California