OAK BROOK ALLERGISTS SC
NPI 1700819117
Allergy & Immunology in Elmhurst, IL

Q: What is Oak Brook Allergists Sc's NPI number?

The NPI number for Oak Brook Allergists Sc is 1700819117. It was assigned to this organization in the NPPES registry on July 9, 2006.

Q: What is Oak Brook Allergists Sc's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Active since July 09, 2006

360 W BUTTERFIELD RD STE 140, ELMHURST, IL 60126(630) 574-0460(630) 574-0470 Get Directions Write a Review

NPPES record last updated: March 12, 2018. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Oak Brook Allergists Sc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

OAK BROOK ALLERGISTS SC (NPI 1700819117) is a healthcare organization registered as an allergy & immunology in Elmhurst, Illinois and active in the NPI registry since July 2006. The organization lists David J Knysak, President, as its authorized official.

NPPES Registry Identity

NPI1700819117

Entity TypeOrganization

Primary Taxonomy207K00000X

Legal Business NameOAK BROOK ALLERGISTS SC

Location Address360 W BUTTERFIELD RD STE 140Elmhurst, IL 60126-5025

Mailing Address360 W Butterfield Rd Ste 140Elmhurst, IL 60126-5025 · (630) 574-0460 · Fax (630) 574-0470

Phone(630) 574-0460

Fax(630) 574-0470

Organization SubpartNo

Authorized OfficialDavid J KnysakPresident · (630) 574-0460

Enumeration DateJuly 9, 2006

Last NPPES UpdateMarch 12, 2018

✔ NPI 1700819117 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians

Taxonomy Code207K00000X

License✔ Licensed in IL · 042000355

Definition

An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.

360 W BUTTERFIELD RD STE 140, Elmhurst, IL 60126

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Oak Brook Allergists Sc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 3 clinicians reassign Medicare billing to Oak Brook Allergists Sc, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.

Clinicians, nearest first (3)

David Knysak, MD

Allergy/Immunology

NPI 1609876101

360 W BUTTERFIELD RD STE 140
Elmhurst, IL 60126

(630) 574-0460

✔ PECOS✔ Accepts MedicareSame address

Zachary Rubin

Allergy/Immunology

NPI 1750775185

360 W BUTTERFIELD RD STE 140
Elmhurst, IL 60126

(630) 574-0460

✔ PECOS✔ Accepts Medicare0.2 mi

Raymond Pongonis, M.D.

Allergy/Immunology

NPI 1023274792

1220 HOBSON RD STE 114
Naperville, IL 60540

(630) 961-2960

✔ PECOS✔ Accepts Medicare11 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Oak Brook Allergists Sc's NPI number?

The NPI number for Oak Brook Allergists Sc is 1700819117. It was assigned to this organization in the NPPES registry on July 9, 2006.

Where is Oak Brook Allergists Sc located?

Oak Brook Allergists Sc is located at 360 W Butterfield Rd Ste 140, Elmhurst, IL 60126. The listed phone number is (630) 574-0460.

What is Oak Brook Allergists Sc's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Oak Brook Allergists Sc enrolled in Medicare?

Yes. Oak Brook Allergists Sc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Oak Brook Allergists Sc?

According to the CMS Revalidation Reassignment List (October 2026 release), 3 clinicians, all in Allergy/Immunology, reassign their Medicare billing to Oak Brook Allergists Sc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Oak Brook Allergists Sc was last updated on March 12, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.