Mark Chwajol, M.D.
Neurological Surgery Physician · Chicago, IL
Mark Chwajol, M.D. is a neurological surgery physician with a practice address in Chicago, Illinois, and NPI 1356575690, issued on May 13, 2009. Check the license (Illinois 036.123878, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark Chwajol
- Credential
- M.D.
- Primary taxonomy
- Neurological Surgery Physician 207T00000X
- License number
- 036.123878 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1740 W Taylor St, Chicago, IL 60612
- Phone
- (886) 600-2273
- Enumerated
- May 13, 2009
- Record last updated
- Jun 30, 2026
- Medicare enrollment
- Enrolled (PECOS I20091105000484); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2010
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest neurological surgery physician records → All 375 in Illinois → Look up another NPI →
Also registered at 1740 W Taylor St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Francisco AbancoCertified Registered Nurse Anesthetist1255844288
- Leena Abbas, MDStudent in an Organized Health Care Education/Training Program1679376594
- Herand AbcarianColon & Rectal Surgery Physician1881792372
- Ivy AbrahamHematology & Oncology Physician1497172845
- Rohit Abraham, MD, MPH, MATPsychiatry Physician1013478932
- Ereni Abuaita, DOInternal Medicine Physician1013710961
Verify Mark Chwajol in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.123878Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average neurological surgery physician in 2024
23 Medicare Part D claims, against an average of 172 among the 4,378 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $685.40
8 payments; by number, the most common kind was food and beverage; the largest payer was Stryker Corporation. The 5,377 providers of this specialty with any payment received $14,925.58 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Osf Multi-Specialty GroupPeoria, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Chwajol among 375 neurological surgery physician records in Illinois
Mark Chwajol, M.D. is one of 375 neurological surgery physician records with a practice address in Illinois. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 52% of them.
- NPI issued2009 · 52% of these records are older, 45% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2010 · median 2004 among the 199 with a school on file
- Record last updated2026 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207T00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurological Surgery Physician providers in Illinois
There are 375 neurological surgery physician records in Illinois.
All 375 in Illinois → Every provider in Chicago → Neurological Surgery Physician nationwide →
The 8 neurological surgery physician records with the nearest ZIP codes
- Sepideh Amin-Hanjani, M.D.Chicago, IL 606121194763318
- Manali Barua, M.D.Chicago, IL 606121861405961
- Fady Charbel, M.D.Chicago, IL 606121700899721
- Herbert Engelhard, M.D., PH.D., F.A.C.SChicago, IL 606121891707469
- Yogesh Gandhi, M.D.Chicago, IL 606121962443952
- Roberta Glick, MDChicago, IL 606121982709168
- Yoon Hahn, M.D.Chicago, IL 606121336236231
- Gerald Lemole, M.D.Chicago, IL 606121215984398
Common questions
What is Mark Chwajol, M.D.'s NPI number?
Mark Chwajol, M.D.'s National Provider Identifier (NPI) is 1356575690, issued on May 13, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Mark Chwajol, M.D. located?
The NPPES record lists a practice address at 1740 W Taylor St, Chicago, IL, 60612. Phone: (886) 600-2273. Providers update this record themselves, so call before visiting.
How can I verify Mark Chwajol, M.D.'s license?
NPPES lists Illinois license number 036.123878, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Chwajol, M.D. prescribe under Medicare Part D?
In 2024, Mark Chwajol, M.D. had 23 Medicare Part D claims; the average among neurological surgery physician prescribers was 172. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.