David Jon Tamura, M.D.
NPI 1295953123ActiveIndividual· Internal Medicine, Hematology & Oncology· Honolulu, HI
Internal Medicine, Hematology & Oncology (M.D.) with American Oncology Partners of Hawaii LLC, practicing in Honolulu, Hawaii. Their prescriptions cost Medicare Part D more than their services did: $11,935,147 for 3,084 claims, against $1,808,982 paid for services in 2024. Geron Corporation was the largest of 60 companies reporting payments in 2025, $5,654 in all, mostly food and beverage. Lists Adventist Health Castle and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1295953123 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 24, 2007 |
| Last updated in NPPES | Feb 10, 2026 |
| Certified by provider | Feb 10, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | MD15078 | HI |
| Internal Medicine, Medical Oncology | 207RX0202X | MD15078 | 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 | 515 |
|---|---|
| Services billed | 74,976 across 138 procedure codes |
| Paid by Medicare | $1,808,982 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,084 · 4,282 30-day fills |
|---|---|
| Patients | 378 |
| Total drug cost | $11,935,147 |
| Generic share | 55% of claims |
Education and affiliations
| Graduation year | 2004 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- American Oncology Partners of Hawaii LLCHonolulu, HI · 7 clinicians
Hospital affiliations
- Adventist Health CastleKailua, HI
- Kapiolani Medical Center for Women & ChildrenHonolulu, HI
- Kuakini Medical CenterHonolulu, HI
- Pali Momi Medical CenterAiea, HI
- The Queens Medical CenterHonolulu, HI
Industry payments (Open Payments)
- 2025$5,654 · 186 payments from 60 companies
- 2024$4,010 · 154 payments from 51 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Geron Corporation | $807.17 | 3 |
| Astrazeneca Pharmaceuticals LP | $336.89 | 22 |
| Astellas Pharma US Inc | $321.50 | 5 |
| Pfizer Inc. | $249.17 | 9 |
| Incyte Corporation | $239.91 | 10 |
What the 2025 payments were for
- Food and Beverage$4,766 · 184 payments
- Consulting Fee$780.00 · 1 payment
- Education$107.32 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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