Mark Chwajol, M.D.

Primary specialty

Neurological Surgery PhysicianTaxonomy code 207T00000X

License

036.123878 Issued in IL

Practice address

1740 W Taylor St
Chicago, IL 60612-7232

Phone

(886) 600-2273

NPI assigned

May 13, 2009

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Other names 1

• Mr. Marek Chwajol Former name

Medicare fee-for-service enrollment

Enrolled in IL

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Neurosurgery

Education

University of Illinois College of Med (CHI/Peor/Rock/CHM-Urb), 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Osf Multi-Specialty GroupGroup PAC ID 3678889789, 2,123 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Saint Anthony Medical Center Hospital, Rockford, IL, CCN 140233
• Osf Saint Elizabeth MDL Ctr Hospital, Peru, IL, CCN 140110

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mchwajol16955@uihealth.direct-ci.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Osf Multi-Specialty Group

  • Internal Medicine Physician
  • Peoria, IL
  • NPI 1922445527
  Medicare reassignment Care Compare group NPD
• Mount Sinai Community Foundation

  • Rehabilitation Hospital
  • Chicago, IL
  • NPI 1376715896
  Medicare reassignment NPD
• The Board of Trustees of the University of Illinois

  • Anatomic Pathology Physician
  • Chicago, IL
  • NPI 1386863819
  Medicare reassignment NPD
• Mount Sinai Community Foundation

  • Family Medicine Physician
  • Des Plaines, IL
  • NPI 1134164841
  NPD
• Mount Sinai Community Foundation

  • General Acute Care Hospital
  • Chicago, IL
  • NPI 1982657854
  NPD
• The Board of Trustees of the University of Illinois

  • Occupational Medicine Physician
  • Chicago, IL
  • NPI 1043727571
  NPD
• The Board of Trustees of the University of Illinois

  • Neurological Surgery Physician
  • Chicago, IL
  • NPI 1558581967
  NPD
• Central PA Pharmacy LLC.

  • Community/Retail Pharmacy
  • Patton, PA
  • NPI 1578541413
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Ottawa Regional Hospital & Healthcare Center

  • General Acute Care Hospital
  • Peru, IL
  • NPI 1588713440
  Care Compare affiliation
• Saint Anthony Medical Center

  • General Acute Care Hospital
  • Rockford, IL
  • NPI 1790739977
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1242172800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782777600000",
    "number": "1356575690",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1350 N WELLS ST",
            "address_2": "APT. F 203",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606101936",
            "telephone_number": "646-675-2670"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1740 W TAYLOR ST",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606127232",
            "telephone_number": "886-600-2273"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "N2950 State Road 67",
            "address_purpose": "LOCATION",
            "city": "Lake Geneva",
            "state": "WI",
            "postal_code": "531472655",
            "country_code": "US",
            "telephone_number": "262-245-0535",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1045 W Stephenson St",
            "address_purpose": "LOCATION",
            "city": "Freeport",
            "state": "IL",
            "postal_code": "610324864",
            "country_code": "US",
            "telephone_number": "815-599-6000",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1000 Mineral Point Ave",
            "address_purpose": "LOCATION",
            "city": "Janesville",
            "state": "WI",
            "postal_code": "535482982",
            "country_code": "US",
            "telephone_number": "608-756-6868",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "875 S Route 31",
            "address_purpose": "LOCATION",
            "city": "Crystal Lake",
            "state": "IL",
            "postal_code": "600148190",
            "country_code": "US",
            "telephone_number": "779-220-5500",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CHWAJOL",
        "first_name": "MARK",
        "name_prefix": "Mr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2009-05-13",
        "last_updated": "2026-06-30",
        "certification_date": "2026-06-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207T00000X",
            "taxonomy_group": "",
            "desc": "Neurological Surgery",
            "state": "IL",
            "license": "036.123878",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "MAREK",
            "last_name": "CHWAJOL",
            "prefix": "MR.",
            "credential": "M.D.",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

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• Neurological Surgery Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Neurological Surgery Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 30, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.