Vivian Hsun-Chien Chou, MD
NPI 1457573420ActiveIndividual· Allergy & Immunology· Evanston, IL
Allergy & Immunology (MD) in Evanston, Illinois, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 2002). Their prescriptions cost Medicare Part D more than their services did: $117,733 for 342 claims, against $7,035 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 15 companies reporting payments in 2025, $1,462 in all, mostly food and beverage.
Overview
| NPI | 1457573420 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | May 2, 2007 |
| Last updated in NPPES | Dec 6, 2021 |
| Certified by provider | Dec 6, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | 036114020 | 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 - Allergy/Immunology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 54 |
|---|---|
| Services billed | 135 across 10 procedure codes |
| Paid by Medicare | $7,035 |
Part D prescriptions in 2024
| Prescriptions (claims) | 342 · 556 30-day fills |
|---|---|
| Patients | 55 |
| Total drug cost | $117,733 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Allergy/Immunology |
| Secondary specialties | Internal Medicine |
Medical group
- Illinois Allergy and Asthma Specialists SCChicago, IL · 2 clinicians
Hospital affiliation
- Northwestern Medicine Central Dupage HospitalWinfield, IL
Industry payments (Open Payments)
- 2025$1,462 · 71 payments from 15 companies
- 2024$2,242 · 96 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $512.93 | 25 |
| Genzyme Corporation | $206.56 | 9 |
| Regeneron Healthcare Solutions, Inc. | $200.26 | 9 |
| Ars Pharmaceuticals Operations, Inc. | $156.24 | 7 |
| Biocryst US Sales Co., LLC | $61.45 | 3 |
What the 2025 payments were for
- Food and Beverage$1,427 · 68 payments
- Consulting Fee$27.96 · 2 payments
- Education$6.77 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Allergy & Immunology providers in Evanston
- 1497701882
- 1720990633
- 1386964252
- 1699978791
- 1801856836