Oak Brook Allergists Sc in Elmhurst, IL
This organization bills under NPI 1700819117, an organization record issued on Jul 9, 2006 with the primary taxonomy Allergy & Immunology Physician. Each clinician who works there has their own NPI and license.
Organization recordNPPES, Aug 2026
1700819117
- Legal name
- Oak Brook Allergists Sc
- Entity
- Type 2 · organization
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- Practice location
- 360 W BUTTERFIELD RD STE 140, Elmhurst, IL 60126
- Phone
- 630-574-0460
- Enumerated
- Jul 9, 2006
- Record updated
- Mar 12, 2018
- Authorized official
- President (title as filed)
1 clinician CMS lists with Oak Brook Allergists Sc in Elmhurst
- David Knysak, MDAllergy & Immunology Physician1609876101
Source: CMS Doctors and Clinicians group affiliations, matched by practice name and city.
Checking an organization
- Confirm the business with the Illinois secretary of state.
- Check the HHS-OIG exclusion list for the organization.
- Verify each clinician on their own record and the state license search.
Common questions
Is an organization NPI a license?
No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.
Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.