Larry W. Kwak, M.D. , PHD
NPI 1134215817ActiveIndividual· Internal Medicine, Hematology· Duarte, CA
Internal Medicine, Hematology (M.D. , PHD) in Duarte, California, licensed in CA, with an NPI issued in October 2006. Mostly services rather than prescriptions: Medicare paid $5,823 for 22 patients in 2024, with only 14 Part D claims. Janssen Research & Development, LLC was the largest of 3 companies reporting payments in 2025, $27,516 in all, mostly consulting fees.
Overview
| NPI | 1134215817 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. , PHD |
| Sole proprietor | No |
| NPI issued | Oct 4, 2006 |
| Last updated in NPPES | Nov 11, 2020 |
| Certified by provider | Nov 11, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology Primary | 207RH0000X | G55439 | CA |
| Internal Medicine, Medical Oncology | 207RX0202X | G55439 | 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 - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 22 |
|---|---|
| Services billed | 57 across 4 procedure codes |
| Paid by Medicare | $5,823 |
Part D prescriptions in 2024
| Prescriptions (claims) | 14 · 22 30-day fills |
|---|---|
| Total drug cost | $169.35 |
| Generic share | 100% of claims |
Industry payments (Open Payments)
- 2025$27,516 · 3 payments from 3 companies
- 2024$25.59 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Research & Development, LLC | $15,000 | 1 |
| Glaxosmithkline, LLC. | $12,500 | 1 |
| Tempus Ai, Inc | $15.79 | 1 |
What the 2025 payments were for
- Consulting Fee$27,500 · 2 payments
- Food and Beverage$15.79 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 61 Internal Medicine, Hematology providers in Duarte · All Internal Medicine, Hematology providers in California