Quick answers
- Where does David J. Knysak see patients?
- Medicare's clinician data lists 1 practice location in Elmhurst, IL. Call before your visit to confirm the address.
- What is David J. Knysak's specialty?
- Medicare lists Allergy/Immunology as the primary specialty.
- Does David J. Knysak accept Medicare assignment?
- Yes. Medicare's clinician data says David J. Knysak accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for David J. Knysak?
- (630) 574-0460, as listed in official Medicare / NPI Registry data.
- What is David J. Knysak's NPI number?
- 1609876101. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where David J. Knysak is enrolled with Medicare (CMS data updated 2026-10-02).
- 360 W Butterfield Rd, Suite 140Elmhurst, IL 60126 (630) 574‑0460
Group practices
Medicare enrollment lists David J. Knysak as a member of this group (CMS data updated 2026-10-02).
- Oak Brook Allergists SC3 clinicians in the group
Specialties
- Allergy/Immunologyprimary
Other allergist and immunologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609876101 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians