Gregory P Witkowski, MD
Orthopedic Surgery · Warrenville, IL
At a glance
27650 Ferry Rd, Warrenville, IL 60555-3845
Published activity: Hip replacement · Removal of tissue. View counts and coverage
NPPES record updated Feb 19, 2018. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
27650 Ferry Rd Suite 100Warrenville, IL 60555-3845
Education & affiliations
- Medical / professional school
- Wayne State University School Of Medicine
- Graduation year
- 2003
- CMS specialties
- Orthopedic Surgery
Practice groups
Reported hospital affiliations
- Northwestern Medicine Central Dupage Hospital Winfield, IL
- Northwestern Medicine Delnor Community Hospital Geneva, IL
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Hip replacement | 1-10 |
| Removal of tissue | 1-10 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Services other than consulting | $2,000.00 |
| Food and beverage | $1,040.96 |
Reporting companies
| Company | Amount |
|---|---|
| ARTERIOCYTE MEDICAL SYSTEMS, INC. | $2,202.50 |
| OAK MED, INC. | $330.25 |
| STRYKER CORPORATION | $290.97 |
| KUROS BIOSCIENCES USA, INC | $132.83 |
| DEPUY SYNTHES SALES INC. | $70.51 |
| ILLUMINOSS MEDICAL, INC. | $13.90 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Orthopedic Surgery
- Taxonomy code
- 207X00000X
- Enumeration date
- May 17, 2007
- Record updated
- Feb 19, 2018
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
207XX0004X
License reported: 036-123834 IL
207X00000X · Primary
License reported: 036123834 IL
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
27650 Ferry RdSuite 100
Warrenville, IL 60555-3845
- Phone
- (630) 225-2663
- Fax
- (630) 225-2399
Mailing address
27650 FERRY RDSUITE 100
WARRENVILLE, IL 605553845
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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