Oak Brook Allergists Sc
Oak Brook Allergists Sc is a healthcare organization registered as Allergy & Immunology Physician in Elmhurst, IL, holding Type 2 (organization) NPI 1700819117 since 2006. The authorized official on file is David Knysak, President.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1700819117 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | Oak Brook Allergists Sc |
| Practice address | 360 W BUTTERFIELD RD STE 140, Elmhurst, IL, 60126 |
| Phone | 6305740460 |
| Fax | 6305740470 |
| Enumeration date | 2006-07-09 |
| Last updated in NPPES | 2018-03-12 |
Authorized official
| Name | David Knysak |
|---|---|
| Title | President |
| Phone | 6305740460 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207K00000X | Allergy & Immunology Physician | Primary | 042000355 | IL |
Copy-ready billing details
Provider: Oak Brook Allergists Sc NPI: 1700819117 Taxonomy: 207K00000X (Allergy & Immunology Physician) Address: 360 W BUTTERFIELD RD STE 140, Elmhurst, IL, 60126
Providers at this address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1609876101 | David Knysak | Individual | Allergy & Immunology Physician | Elmhurst, IL |
| 1720331473 | Tammy Laas | Individual | Family Nurse Practitioner | Elmhurst, IL |
| 1750775185 | Zachary Rubin | Individual | Allergy & Immunology Physician | Elmhurst, IL |
Verify this record
Cross-check NPI 1700819117 against the authoritative CMS record: view Oak Brook Allergists Sc on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Who is the authorized official for Oak Brook Allergists Sc?
What is the NPI number for Oak Brook Allergists Sc?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2018-03-12.