David Taehyung Ahn, MD
NPI 1184949570ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Newport Beach, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Newport Beach, California, trained at University of California, San Diego School of Medicine (class of 2010). Their prescriptions cost Medicare Part D more than their services did: $818,717 for 1,143 claims, against $195,665 paid for services in 2024. Lilly USA, LLC was the largest of 14 companies reporting payments in 2025, $119,242 in all, mostly speaking and faculty fees.
Overview
| NPI | 1184949570 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Mar 29, 2010 |
| Last updated in NPPES | Sep 25, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A117662 | 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 - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 527 |
|---|---|
| Services billed | 2,393 across 14 procedure codes |
| Paid by Medicare | $195,665 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,143 · 2,418 30-day fills |
|---|---|
| Patients | 254 |
| Total drug cost | $818,717 |
| Generic share | 29% of claims |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 2010 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
Medical group
- David Ahn MD IncNewport Beach, CA · 4 clinicians
Hospital affiliation
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
Industry payments (Open Payments)
- 2025$119,242 · 153 payments from 14 companies
- 2024$143,798 · 239 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $23,219 | 25 |
| Novo Nordisk Inc | $22,342 | 21 |
| Ascensia Diabetes Care US Inc. | $17,994 | 16 |
| Abbott Laboratories | $10,863 | 25 |
| Eli Lilly and Company | $10,812 | 21 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$66,556 · 36 payments
- Compensation for serving as faculty or as a speaker for a medical education program$19,186 · 8 payments
- Consulting Fee$15,552 · 7 payments
- Travel and Lodging$11,203 · 31 payments
- Honoraria$3,620 · 3 payments
- Food and Beverage$3,126 · 68 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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