Quick answers
- Which hospitals does Mark Chwajol work at?
- Medicare's official clinician data lists Mark Chwajol at 3 hospitals: Mercy Health System Corp, OSF Saint Elizabeth MDL Ctr and Saint Anthony Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Chwajol see patients?
- Medicare's clinician data lists 2 practice locations, including Peoria, IL and Crystal Lake, IL. Call before your visit to confirm the address.
- What is Mark Chwajol's specialty?
- Medicare lists Neurosurgery as the primary specialty.
- Does Mark Chwajol accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Chwajol accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Mark Chwajol offer telehealth?
- Medicare's clinician data says Mark Chwajol offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark Chwajol?
- (309) 683-5050, as listed in official Medicare / NPI Registry data.
- What is Mark Chwajol's NPI number?
- 1356575690. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Chwajol works
Medicare's Facility Affiliation Data lists Mark Chwajol at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · CCN 520066
- OSF Saint Elizabeth MDL CtrPeru, IL · Acute Care Hospital · CCN 140110
- Saint Anthony Medical CenterRockford, IL · Acute Care Hospital · CCN 140233
Practice locations
Addresses where Mark Chwajol is enrolled with Medicare (CMS data updated 2026-10-02).
- 8600 State Route 91, Suite 130Peoria, IL 61615 (309) 683‑5050
- 875 S Route 31Crystal Lake, IL 60014 (779) 220‑5500
Group practices
Medicare enrollment lists Mark Chwajol as a member of these groups (CMS data updated 2026-10-02).
- OSF Multi-Specialty Group2,114 clinicians in the group
- Mercy Health System Corporation753 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in Peoria
Clinicians with the same Medicare primary specialty in Peoria, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1356575690 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians