GREGORY P WITKOWSKI MD
NPI 1750598850
Orthopaedic Surgery in Warrenville, IL

Q: What is Gregory Witkowski's NPI number?

The NPI number for Gregory Witkowski is 1750598850. It was assigned to this individual provider in the NPPES registry on May 17, 2007.

Q: What is Gregory Witkowski's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Witkowski was last updated on February 19, 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.

Active since May 17, 2007PECOS EnrolledAccepts Medicare Assignment

94.1/100

CMS Quality Rating

27650 FERRY RD, SUITE 100, WARRENVILLE, IL 60555(630) 225-2663(630) 225-2399 Get Directions Write a Review

NPPES record last updated: February 19, 2018. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Gregory P Witkowski Md NPPES

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

GREGORY P WITKOWSKI MD (NPI 1750598850) is an individual orthopaedic surgery provider in Warrenville, Illinois, licensed in Illinois (036123834) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Delnor Community Hospital, and is a graduate of Wayne State University School Of Medicine (2003).

NPPES Registry Identity

NPI1750598850

Entity TypeIndividualMale

Primary Taxonomy207X00000X

Provider Legal NameGREGORY P WITKOWSKICredential: MD

Location Address27650 FERRY RD, SUITE 100Warrenville, IL 60555-3845

Mailing Address27650 Ferry Rd, Suite 100Warrenville, IL 60555-3845 · (630) 225-2663 · Fax (630) 225-2399

Phone(630) 225-2663

Fax(630) 225-2399

Sole ProprietorNo

Medical School CMSWayne State University School Of MedicineGraduated 2003

Enumeration DateMay 17, 2007

Last NPPES UpdateFebruary 19, 2018

✔ NPI 1750598850 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code207X00000X

License✔ Licensed in IL · 036123834

Definition

An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

Also ListedOrthopaedic Surgery · Foot and Ankle SurgeryTaxonomy 207XX0004X · License 036-123834 (IL)

27650 FERRY RD, Warrenville, IL 60555

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Other Identifiers 4

OtherP01179010IL · Rr Medicare

Medicaid036123834IL

Other206147IL · Medicare Group

Other206147133IL · Medicare Individual

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Gregory P Witkowski Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1052485133

PECOS Enrollment IDI20090819000237

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Gregory Witkowski reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Central Dupage Physician Group

4.3 mi

Family Medicine

5777 DEPARTMENT
Carol Stream, IL 60122

Reassigned Medicare billing, Illinois enrollment
1,664 clinicians in this Medicare group

NPI 1033149844 (630) 933-3300

Northwestern Medical Faculty Foundation

17 mi

Multi-Specialty

DEPT 5777
Carol Stream, IL 60122

Reassigned Medicare billing, Illinois enrollment
4,817 clinicians in this Medicare group

NPI 1346235314 (855) 694-2866

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

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

303 services195 patients

X-ray of ankle, minimum of 3 views 73610

An ankle X-ray is a quick, painless imaging test. It involves capturing at least three different images or 'views' of your ankle using small amounts of radiation. These images help identify any abnormalities or injuries, such as fractures or arthritis.

172 services88 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

164 services144 patients

X-ray of shoulder, minimum of 2 views 73030

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

99 services39 patients

X-ray of foot, minimum of 3 views 73630

An X-ray of the foot, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones and tissues in your foot. This helps to identify fractures, infections, or other abnormalities. Multiple views ensure a comprehensive examination.

92 services63 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

60 services60 patients

X-ray of knee, 1-2 views 73560

An X-ray of the knee with 1-2 views is a quick, painless test that produces images of the knee bones. It helps identify fractures, infections, or changes in the knee joint. During the procedure, you'll be asked to stay still while the X-ray machine captures the images.

59 services33 patients

X-ray of thigh bone, minimum 2 views 73552

An X-ray of the thigh bone is a non-invasive imaging test. It involves passing a small amount of radiation through the thigh to produce images of the bone structure. At least two different angles are captured for a comprehensive view. This helps detect fractures, infections, or other abnormalities.

48 services22 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

41 services29 patients

Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg J0702

This injection contains two medications, betamethasone acetate and betamethasone sodium phosphate. It is used to reduce inflammation and pain. It's given by a healthcare professional, often directly into the area causing discomfort.

39 services11 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

30 services30 patients

X-ray of collar bone 73000

An X-ray of the collar bone is a quick, painless test that produces images of this bone to help diagnose fractures or other abnormalities. The procedure involves a small amount of radiation to capture these images. During the test, you'll be asked to stay still to ensure clear results.

27 services17 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

22 services22 patients

X-ray of pelvis, 1-2 views 72170

An X-ray of the pelvis, 1-2 views, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the lower part of your torso. These images help to detect any abnormalities or injuries in your hip bones and surrounding structures.

20 services14 patients

X-ray of lower leg, 2 views 73590

An X-ray of the lower leg, 2 views, is a quick, painless test that produces images of the bones in your lower leg. It helps to identify fractures, infections, or diseases. Two different angles are used to provide a comprehensive view of the leg's structure.

18 services12 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

16 services16 patients

X-ray of ankle, minimum of 3 views 73610

13 services13 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Northwestern Medicine Delnor Community Hospital

Acute Care Hospitals · Geneva, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140211

Location300 Randall RdGeneva, IL 60134 · Kane County

Emergency services Birthing friendly

Northwestern Medicine Central Dupage Hospital

Acute Care Hospitals · Winfield, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140242

Location25 North Winfield RoadWinfield, IL 60190 · Du Page County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60555 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$93.02 typical visit price

range $59.81 – $181.38

Typical copayment $23.25 (range $14.95 – $45.34)

Most-billed visit code 99203

Established Patient

$74.38 typical visit price

range $19.15 – $147.12

Typical copayment $18.59 (range $4.78 – $36.78)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

94.1/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

82.59

Promoting Interoperability

100

Improvement Activities

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Walking boot, pneumatic and/or vacuum, with or without joints, with or without interface material, prefabricated, off-the-shelf L4361

DME-Orthotic Devices · category DF003N

2 suppliers15 claims15 services$216.62 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SAFEYA SHAH OT

Specialist

27650 FERRY RD
WARRENVILLE, IL 60555

Dupage County (630) 225-2663

MRS. KARLY FRANCES DAVIS ATC

Specialist/Technologist (Athletic Trainer)

27650 FERRY RD
WARRENVILLE, IL 60555

Dupage County (630) 225-2663

GENO TUCCI

Physical Therapy Assistant

27650 FERRY RD
WARRENVILLE, IL 60555

Dupage County (630) 649-4366

JEROME L KOLAVO MD

Orthopaedic Surgery (Orthopaedic Surgery of the Spine)

27650 FERRY RD, SUITE 100
WARRENVILLE, IL 60555

Dupage County (630) 225-2663

DAVID K CHANG MD

Orthopaedic Surgery

27650 FERRY RD, SUITE 100
WARRENVILLE, IL 60555

Dupage County (630) 225-2663

DANIEL J. O'DONNELL PA

Physician Assistant (Surgical)

27650 FERRY RD
WARRENVILLE, IL 60555

Dupage County (630) 225-2663

BRIAN D STEINKE M.D.

Orthopaedic Surgery (Orthopaedic Surgery of the Spine)

27650 FERRY RD, STE 100
WARRENVILLE, IL 60555

Dupage County (630) 225-2663

JOSHUA J. WARD M.D.

Physical Medicine & Rehabilitation

27650 FERRY RD
WARRENVILLE, IL 60555

Dupage County (630) 225-2663

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 Gregory Witkowski's NPI number?

The NPI number for Gregory Witkowski is 1750598850. It was assigned to this individual provider in the NPPES registry on May 17, 2007.

Where is Gregory Witkowski located?

Gregory Witkowski practices at 27650 Ferry Rd Suite 100, Warrenville, IL 60555. The listed phone number is (630) 225-2663.

What is Gregory Witkowski's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Is Gregory Witkowski enrolled in Medicare?

Yes. Gregory Witkowski is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Gregory Witkowski's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Witkowski reassigns Medicare benefits to 2 organizations: Central Dupage Physician Group (Carol Stream, IL) and Northwestern Medical Faculty Foundation (Carol Stream, IL). Each 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 Gregory Witkowski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Gregory Witkowski affiliated with any hospitals?

According to CMS data, Gregory Witkowski is affiliated with Northwestern Medicine Delnor Community Hospital and Northwestern Medicine Central Dupage Hospital.

When was this NPI record last updated?

The NPPES record for Gregory Witkowski was last updated on February 19, 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.