Leonard Tiger Onsen
NPI 1104321421ActiveIndividual· Orthopaedic Surgery, Sports Medicine· Los Angeles, CA
Orthopaedic Surgery, Sports Medicine with Osf Multi-Specialty Group, practicing in Los Angeles, California. Mostly services rather than prescriptions: Medicare paid $42,341 for 124 patients in 2024, with only 32 Part D claims. Stryker Corporation was the largest of 2 companies reporting payments in 2025, $338.45 in all, mostly food and beverage. Lists Osf Saint Clare Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1104321421 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | Yes |
| NPI issued | Mar 28, 2018 |
| Last updated in NPPES | Nov 17, 2025 |
| Certified by provider | Nov 17, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery, Sports Medicine Primary | 207XX0005X | A185557 | CA |
| Orthopaedic Surgery, Sports Medicine | 207XX0005X | 036171278 | IL |
| Orthopaedic Surgery | 207X00000X | 036171278 | IL |
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 - Sports Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 124 |
|---|---|
| Services billed | 2,298 across 42 procedure codes |
| Paid by Medicare | $42,341 |
Part D prescriptions in 2024
| Prescriptions (claims) | 32 · 32 30-day fills |
|---|---|
| Patients | 21 |
| Total drug cost | $143.40 |
| Generic share | 100% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Sports Medicine |
| Secondary specialties | Orthopedic Surgery |
Medical group
- Osf Multi-Specialty GroupMorton, IL · 2,114 clinicians
Hospital affiliations
- Osf Saint Clare Medical CenterPrinceton, IL
- Osf Saint Elizabeth Mdl CtrPeru, IL
- Osf Saint Paul Medical CenterMendota, IL
Industry payments (Open Payments)
- 2025$338.45 · 8 payments from 2 companies
- 2024$5,924 · 26 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Stryker Corporation | $311.95 | 7 |
| Oak Med, Inc. | $26.50 | 1 |
What the 2025 payments were for
- Food and Beverage$338.45 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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