Terrie Susie Ahn, MD
NPI 1093166795ActiveIndividual· Allergy & Immunology· Santa Monica, CA
Allergy & Immunology (MD) in Santa Monica, California, trained at Wayne State University School of Medicine (class of 2016). Their prescriptions cost Medicare Part D more than their services did: $429,981 for 425 claims, against $28,072 paid for services in 2024. Genzyme Corporation was the largest of 5 companies reporting payments in 2025, $759.22 in all, mostly food and beverage.
Overview
| NPI | 1093166795 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 24, 2016 |
| Last updated in NPPES | Aug 4, 2022 |
| Certified by provider | Aug 4, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | A162214 | CA |
| Pediatrics | 208000000X | A162214 | 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) | Enrolled Practitioner - Allergy/Immunology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 125 |
|---|---|
| Services billed | 1,161 across 25 procedure codes |
| Paid by Medicare | $28,072 |
Part D prescriptions in 2024
| Prescriptions (claims) | 425 · 651 30-day fills |
|---|---|
| Patients | 112 |
| Total drug cost | $429,981 |
| Generic share | 60% of claims |
Education and affiliations
| Medical school | Wayne State University School of Medicine |
|---|---|
| Graduation year | 2016 |
| Medicare specialty | Allergy/Immunology |
| Telehealth | Offers telehealth |
Medical group
- The Regents of the University of CaliforniaSanta Monica, CA · 1,462 clinicians
Hospital affiliations
- Ronald Reagan UCLA Medical CenterLos Angeles, CA
- Santa Monica - UCLA Med Ctr & Orthopaedic HospitalSanta Monica, CA
Industry payments (Open Payments)
- 2025$759.22 · 11 payments from 5 companies
- 2024$254.40 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $326.93 | 4 |
| Galderma Laboratories, L.P. | $149.28 | 4 |
| Leo Pharma Inc. | $133.73 | 1 |
| Ionis Pharmaceuticals, Inc. | $119.70 | 1 |
| Amgen Inc. | $29.58 | 1 |
What the 2025 payments were for
- Food and Beverage$759.22 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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