Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MR. MARK CHWAJOL M.D.
NPI 1356575690
Neurological Surgery in Chicago, IL

Active since May 13, 2009PECOS EnrolledAccepts Medicare Assignment
1740 W TAYLOR ST, CHICAGO, IL 60612(886) 600-2273 Get Directions Write a Review

NPPES record last updated: June 30, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mr. Mark Chwajol M.d. NPPES

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

MR. MARK CHWAJOL M.D. (NPI 1356575690) is an individual neurological surgery provider in Chicago, Illinois, licensed in Illinois (036.123878) and active in the NPI registry since May 2009. He is enrolled in Medicare PECOS, is affiliated with Katherine Shaw Bethea Hospital, and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1356575690
Entity TypeIndividualMale
Primary Taxonomy207T00000X
Provider Legal NameMR. MARK CHWAJOLCredential: M.D.
Location Address1740 W TAYLOR STChicago, IL 60612-7232
Mailing Address1350 N Wells St, Apt. F 203Chicago, IL 60610-1936 · (646) 675-2670
Sole ProprietorNo
Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 2010
Enumeration DateMay 13, 2009
Last NPPES UpdateJune 30, 2026
NPPES CertifiedJune 30, 2026
NPI 1356575690 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyNeurological SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207T00000X
License Licensed in IL · 036.123878
Definition
A neurological surgeon provides the operative and non-operative management (i.e., prevention, diagnosis, evaluation, treatment, critical care, and rehabilitation) of disorders of the central, peripheral, and autonomic nervous systems, including their supporting structures and vascular supply; the evaluation and treatment of pathological processes which modify function or activity of the nervous system; and the operative and non-operative management of pain. A neurological surgeon treats patients with disorders of the nervous system; disorders of the brain, meninges, skull, and their blood supply, including the extracranial carotid and vertebral arteries; disorders of the pituitary gland; disorders of the spinal cord, meninges, and vertebral column, including those which may require treatment by spinal fusion or instrumentation; and disorders of the cranial and spinal nerves throughout their distribution.
1740 W TAYLOR ST, Chicago, IL 60612

Other Names 1

Former Name (1)Mr. Marek Chwajol M.d.

Secondary Practice Locations 4

Location 1N2950 State Road 67Lake Geneva, WI 53147-2655 · Phone (262) 245-0535
Location 21045 W Stephenson StFreeport, IL 61032-4864 · Phone (815) 599-6000
Location 31000 Mineral Point AveJanesville, WI 53548-2982 · Phone (608) 756-6868
Location 4875 S Route 31Crystal Lake, IL 60014-8190 · Phone (779) 220-5500

Accepted Insurance

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare and accepts Medicare assignment

Mr. Mark Chwajol M.d. 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 ID9032257407
PECOS Enrollment IDI20091105000484
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.

Areas of Expertise CMS Part B claims 3

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.

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.
27 services27 patients
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.
23 services20 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.
15 services14 patients

Hospital Affiliations CMS Care Compare 4

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

Katherine Shaw Bethea Hospital

Acute Care Hospitals · Dixon, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140012
Location403 E 1st StDixon, IL 61021 · Lee County
Emergency services Birthing friendly

Osf Saint Elizabeth Mdl Ctr

Acute Care Hospitals · Ottawa, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140110
Location1100 E Norris DriveOttawa, IL 61350 · La Salle County
Emergency services Birthing friendly

Saint Anthony Medical Center

Acute Care Hospitals · Rockford, IL
2/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140233
Location5666 East State StreetRockford, IL 61108 · Winnebago County
Emergency services Birthing friendly

Osf Saint Paul Medical Center

Critical Access Hospitals · Mendota, IL
OwnershipVoluntary non-profit - Church
CMS Certification Number141310
Location1401 E 12th StreetMendota, IL 61342 · La Salle County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 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
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$74.80 typical visit price
range $18.97 – $148.12
Typical copayment $18.70 (range $4.74 – $37.03)
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.

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.

Occupational Therapist
1740 W TAYLOR ST, C100
CHICAGO, IL 60612
Physician Assistant (Surgical)
1740 W TAYLOR ST, 3F OCC
CHICAGO, IL 60612
Orthopaedic Surgery (Adult Reconstructive Orthopaedic Surgery)
1740 W TAYLOR ST
CHICAGO, IL 60612
Anesthesiology
1740 W TAYLOR ST
CHICAGO, IL 60612
Pediatrics (Neonatal-Perinatal Medicine)
1740 W TAYLOR ST
CHICAGO, IL 60612
Family Medicine
1740 W TAYLOR ST
CHICAGO, IL 60612
Ophthalmology
1740 W TAYLOR ST
CHICAGO, IL 60612
Emergency Medicine
1740 W TAYLOR ST
CHICAGO, IL 60612

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 Mark Chwajol's NPI number?

The NPI number for Mark Chwajol is 1356575690. It was assigned to this individual provider in the NPPES registry on May 13, 2009. The provider is also known as Mr. Marek Chwajol M.D..

Where is Mark Chwajol located?

Mark Chwajol practices at 1740 W Taylor St, Chicago, IL 60612. The listed phone number is (886) 600-2273.

What is Mark Chwajol's specialty?

The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.

Is Mark Chwajol enrolled in Medicare?

Yes. Mark Chwajol 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.

What insurance does Mark Chwajol accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Home State Health list Mark Chwajol as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mark Chwajol affiliated with any hospitals?

According to CMS data, Mark Chwajol is affiliated with Katherine Shaw Bethea Hospital, Osf Saint Elizabeth Mdl Ctr, Saint Anthony Medical Center and Osf Saint Paul Medical Center.

When was this NPI record last updated?

The NPPES record for Mark Chwajol was last updated on June 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 46 days 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.