Denis J. Yoshii, D.O.
NPI 1124091814ActiveIndividual· Allergy & Immunology· Costa Mesa, CA
Allergy & Immunology (D.O.) in Costa Mesa, California, licensed in CA and NV, with an NPI issued in February 2006. Their prescriptions cost Medicare Part D more than their services did: $211,536 for 299 claims, against $41,091 paid for services in 2024. Genzyme Corporation was the largest of 10 companies reporting payments in 2025, $1,182 in all, mostly food and beverage.
Overview
| NPI | 1124091814 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Feb 11, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | 20A6936 | CA |
| Allergy & Immunology | 207K00000X | 1005 | NV |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Allergy/Immunology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 53 |
|---|---|
| Services billed | 1,734 across 15 procedure codes |
| Paid by Medicare | $41,091 |
Part D prescriptions in 2024
| Prescriptions (claims) | 299 · 444 30-day fills |
|---|---|
| Patients | 58 |
| Total drug cost | $211,536 |
| Generic share | 60% of claims |
Education and affiliations
| Graduation year | 1995 |
|---|---|
| Medicare specialty | Allergy/Immunology |
| Secondary specialties | Pediatric Medicine |
Industry payments (Open Payments)
- 2025$1,182 · 55 payments from 10 companies
- 2024$968.69 · 57 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $269.13 | 13 |
| Regeneron Healthcare Solutions, Inc. | $240.76 | 12 |
| Astrazeneca Pharmaceuticals LP | $159.26 | 16 |
| Csl Behring | $156.41 | 7 |
| Cycle Pharmaceuticals Inc | $115.03 | 2 |
What the 2025 payments were for
- Food and Beverage$1,031 · 53 payments
- Education$151.34 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records