Clayton V. Chan, MD
NPI 1346340239ActiveIndividual· Internal Medicine, Medical Oncology· Honolulu, HI
Internal Medicine, Medical Oncology (MD) in Honolulu, Hawaii, trained at University of Hawaii John A. Burns School of Medicine (class of 1981). Their prescriptions cost Medicare Part D more than their services did: $719,546 for 260 claims, against $18,082 paid for services in 2024. Pfizer Inc. was the largest of 7 companies reporting payments in 2025, $374.97 in all, mostly food and beverage.
Overview
| NPI | 1346340239 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Sep 22, 2006 |
| Last updated in NPPES | Oct 10, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | MD-5800 | HI |
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 - Hematology/Oncology (HI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 112 |
|---|---|
| Services billed | 259 across 8 procedure codes |
| Paid by Medicare | $18,082 |
Part D prescriptions in 2024
| Prescriptions (claims) | 260 · 321 30-day fills |
|---|---|
| Patients | 87 |
| Total drug cost | $719,546 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of Hawaii John A. Burns School of Medicine |
|---|---|
| Graduation year | 1981 |
| Medicare specialty | Hematology/Oncology |
Medical group
- Hilo Benioff Medical CenterHilo, HI · 129 clinicians
Hospital affiliation
- Hilo Benioff Medical CenterHilo, HI
Industry payments (Open Payments)
- 2025$374.97 · 12 payments from 7 companies
- 2024$986.94 · 37 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $142.80 | 2 |
| Abbvie Inc. | $65.00 | 3 |
| Coherus Oncology, Inc. | $60.63 | 2 |
| Daiichi Sankyo Inc. | $51.83 | 2 |
| Caris Mpi, Inc. | $23.97 | 1 |
What the 2025 payments were for
- Food and Beverage$374.97 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All Internal Medicine, Medical Oncology providers in Hawaii →