Quick answers
- Which hospitals does Marius J. Katilius work at?
- Medicare's official clinician data lists Marius J. Katilius at 5 hospitals: Advocate Illinois Masonic Medical Center, Mercy Health System Corp, Morris Hospital & Healthcare Centers, Saint Joseph Medical Center and Silver Cross Hospital and Medical Centers. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marius J. Katilius see patients?
- Medicare's clinician data lists 5 practice locations, including Janesville, WI, Joliet, IL and Buffalo Grove, IL. Call before your visit to confirm the address.
- What is Marius J. Katilius's specialty?
- Medicare lists General Surgery as the primary specialty.
- Does Marius J. Katilius accept Medicare assignment?
- Yes. Medicare's clinician data says Marius J. Katilius 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.
- What is the phone number for Marius J. Katilius?
- (608) 756-6000, as listed in official Medicare / NPI Registry data.
- What is Marius J. Katilius's NPI number?
- 1659346583. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marius J. Katilius works
Medicare's Facility Affiliation Data lists Marius J. Katilius at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Illinois Masonic Medical CenterChicago, IL · Acute Care Hospital · CCN 140182
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · CCN 520066
- Morris Hospital & Healthcare CentersMorris, IL · Acute Care Hospital · CCN 140101
- Saint Joseph Medical CenterJoliet, IL · Acute Care Hospital · CCN 140007
- Silver Cross Hospital and Medical CentersNew Lenox, IL · Acute Care Hospital · CCN 140213
Practice locations
Addresses where Marius J. Katilius is enrolled with Medicare (CMS data updated 2026-10-02).
- 1000 Mineral Point AveJanesville, WI 53548 (608) 756‑6000
- 2 Uno CirJoliet, IL 60435 (815) 725‑2277
- 214 McHenry RdBuffalo Grove, IL 60089 (847) 459‑1160
- 836 W Wellington, Suite G346Chicago, IL 60657 (773) 296‑7147
- 836 W Wellington AveChicago, IL 60657
Group practices
Medicare enrollment lists Marius J. Katilius as a member of these groups (CMS data updated 2026-10-02).
- Advocate Health and Hospitals Corporation3,118 clinicians in the group
- Dupage Medical Group Ltd1,322 clinicians in the group
- Mercy Health System Corporation753 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Janesville
Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659346583 |
| 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