Aaron Westreich, M.D.
NPI 1801329735ActiveIndividual· Allergy & Immunology· Valley Stream, NY
Allergy & Immunology (M.D.) in Valley Stream, New York, trained at University of Maryland School of Medicine (class of 2017). Their prescriptions cost Medicare Part D more than their services did: $121,805 for 313 claims, against $26,914 paid for services in 2024. Genzyme Corporation was the largest of 8 companies reporting payments in 2025, $977.68 in all, mostly food and beverage.
Overview
| NPI | 1801329735 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 7, 2017 |
| Last updated in NPPES | Jun 23, 2025 |
| Certified by provider | Jun 23, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | 315428 | NY |
| Pediatrics | 208000000X | DR.0063992 | CO |
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 (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 95 |
|---|---|
| Services billed | 2,554 across 15 procedure codes |
| Paid by Medicare | $26,914 |
Part D prescriptions in 2024
| Prescriptions (claims) | 313 · 427 30-day fills |
|---|---|
| Patients | 107 |
| Total drug cost | $121,805 |
| Generic share | 72% of claims |
Education and affiliations
| Medical school | University of Maryland School of Medicine |
|---|---|
| Graduation year | 2017 |
| Medicare specialty | Allergy/Immunology |
Medical group
- ENT and Allergy Associates LLPForest Hills, NY · 432 clinicians
Industry payments (Open Payments)
- 2025$977.68 · 35 payments from 8 companies
- 2024$1,116 · 32 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $492.89 | 18 |
| Lilly USA, LLC | $125.00 | 1 |
| Novartis Pharmaceuticals Corporation | $105.89 | 4 |
| Astrazeneca Pharmaceuticals LP | $85.22 | 5 |
| Regeneron Healthcare Solutions, Inc. | $74.95 | 2 |
What the 2025 payments were for
- Food and Beverage$977.68 · 35 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other allergists in Valley Stream
- 1083908453
- 1477549475