Quick answers
- Which hospitals does Gregory P. Witkowski work at?
- Medicare's official clinician data lists Gregory P. Witkowski at 2 hospitals: Northwestern Medicine Central Dupage Hospital and Northwestern Medicine Delnor Community Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory P. Witkowski see patients?
- Medicare's clinician data lists 8 practice locations, including Wheaton, IL, Winfield, IL and Glenview, IL. Call before your visit to confirm the address.
- What is Gregory P. Witkowski's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Gregory P. Witkowski accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory P. Witkowski 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 Gregory P. Witkowski?
- (630) 933-4800, as listed in official Medicare / NPI Registry data.
- What is Gregory P. Witkowski's NPI number?
- 1750598850. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory P. Witkowski works
Medicare's Facility Affiliation Data lists Gregory P. Witkowski at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · CCN 140242
- Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · CCN 140211
Practice locations
Addresses where Gregory P. Witkowski is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 8; the Medicare profile lists all.
- 1800 N Main StWheaton, IL 60187 (630) 933‑4800
- 25 N Winfield RdWinfield, IL 60190
- 2600 Compass RdGlenview, IL 60026
- 27650 Ferry RdWarrenville, IL 60555 (630) 225‑2663
- 27650 Ferry Rd, Suite 100Warrenville, IL 60555 (630) 225‑2663
Group practices
Medicare enrollment lists Gregory P. Witkowski as a member of these groups (CMS data updated 2026-10-02).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
- Select Rehabilitation, LLC2,046 clinicians in the group
- Central Dupage Physician Group1,080 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1750598850 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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