Kenneth W. Lien, MD
NPI 1396823092ActiveIndividual· Allergy & Immunology, Allergy· Castro Valley, CA
Allergy & Immunology, Allergy (MD) in Castro Valley, California, trained at University of Chicago, Pritzker School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $514,367 for 1,059 claims, against $63,606 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 17 companies reporting payments in 2025, $2,085 in all, mostly food and beverage.
Overview
| NPI | 1396823092 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 1, 2006 |
| Last updated in NPPES | Feb 3, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology, Allergy Primary | 207KA0200X | A72098 | 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 - Allergy/Immunology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 174 |
|---|---|
| Services billed | 6,920 across 15 procedure codes |
| Paid by Medicare | $63,606 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,059 · 1,660 30-day fills |
|---|---|
| Patients | 163 |
| Total drug cost | $514,367 |
| Generic share | 63% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Allergy/Immunology |
| Telehealth | Offers telehealth |
Industry payments (Open Payments)
- 2025$2,085 · 88 payments from 17 companies
- 2024$1,376 · 51 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $743.44 | 33 |
| Genzyme Corporation | $225.23 | 11 |
| Regeneron Healthcare Solutions, Inc. | $203.99 | 6 |
| Amgen Inc. | $194.47 | 8 |
| Lilly USA, LLC | $134.53 | 5 |
What the 2025 payments were for
- Food and Beverage$2,070 · 87 payments
- Education$15.27 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Allergy & Immunology, Allergy providers in Castro Valley
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