Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mr. Mark Chwajol, MD

Individual provider Neurological Surgery Physician · NPI 1356575690

Mr. Mark Chwajol, MD is a Neurosurgery in Chicago, Illinois. Graduated from University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb) in 2010, 16 years ago. Practices with Osf Multi-Specialty Group, a 2,128-clinician group, works from 5 locations, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
16
Trained at
University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb)
Licensed in
IL
In the registry since
2009
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1740 W Taylor St
Chicago, IL 60612-7232
Phone: (886) 600-2273
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (4)

  • 875 S Route 31, Crystal Lake, IL 60014-8190 — (779) 220-5500
  • 1045 W Stephenson St, Freeport, IL 61032-4864 — (815) 599-6000
  • 1000 Mineral Point Ave, Janesville, WI 53548-2982 — (608) 756-6868
  • N2950 State Road 67, Lake Geneva, WI 53147-2655 — (262) 245-0535

Specialties & licences

Neurological Surgery Physician (primary) Taxonomy 207T00000X · Licence 036.123878 (IL)

Record details

NPI number1356575690
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 13, 2009
Last updated in NPPESJune 30, 2026
Certification dateJune 30, 2026
Mailing address1350 N Wells St, Apt. F 203, Chicago, IL 60610-1936

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEUROSURGERY
Medical schoolUNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduated 2010 (16 years in practice)
Group practice Osf Multi-Specialty Group — 2128 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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