Gemma Tok Hyon Ko, M.D.
NPI 1437167715ActiveIndividual· Internal Medicine· Pico Rivera, CA
Internal Medicine (M.D.) in Pico Rivera, California, trained at University of Hawaii John A. Burns School of Medicine (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $352,866 for 3,591 claims, against $45,642 paid for services in 2024. Lundbeck LLC was the largest of 5 companies reporting payments in 2025, $336.17 in all, mostly food and beverage.
Overview
| NPI | 1437167715 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 3, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G70866 | 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 | 52 |
|---|---|
| Services billed | 783 across 18 procedure codes |
| Paid by Medicare | $45,642 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,591 · 6,799 30-day fills |
|---|---|
| Patients | 145 |
| Total drug cost | $352,866 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of Hawaii John A. Burns School of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Internal Medicine |
Medical group
- Gemma Th Ko,md. Inc.Pico Rivera, CA · 2 clinicians
Hospital affiliation
- Pih Health Hospital-WhittierWhittier, CA
Industry payments (Open Payments)
- 2025$336.17 · 16 payments from 5 companies
- 2024$111.81 · 5 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lundbeck LLC | $116.26 | 5 |
| Otsuka America Pharmaceutical, Inc. | $94.02 | 5 |
| Novo Nordisk Inc | $57.82 | 3 |
| Amgen Inc. | $46.71 | 2 |
| Bayer Healthcare Pharmaceuticals Inc. | $21.36 | 1 |
What the 2025 payments were for
- Food and Beverage$336.17 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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