Chicago medical billing company: what is different in Cook County

Timely filing in Chicago

Major payers

Which Medicaid plans pay Chicago claims?

Six HealthChoice Illinois plan names matter for a Cook County claim: five that serve every Illinois county and one, CountyCare Health Plan, that serves Cook County only. That comes from the HFS Medicaid Managed Care Program Map dated January 1, 2026, which lists Aetna Better Health, Blue Cross Community Health Plans, Meridian and Molina HealthCare as statewide, YouthCare for children and young people in DCFS care, and CountyCare as the Cook-only plan.

CountyCare is owned by Cook County Health, the county's public health system, and its provider relations contacts on the HFS list carry cookcountyhealth.org addresses. So a Chicago hospital that bills CountyCare is billing a plan run by the same public system that runs Stroger Hospital. Your payer contract team and your patient access team should know that before a denial turns into a dispute.

Medicaid timely filing for fee-for-service, the HFS handbook and the Medicare contractor are covered once on the Illinois page. This page only adds what changes inside Cook County. Because the plan can change at redetermination, run eligibility verification at each visit, not once at registration.

What are CountyCare's claim rules for a Chicago provider?

CountyCare takes a claim only if it arrives within 180 calendar days from the date of service, or the date of discharge, whichever is later, according to the plan's provider page. That limit can be extended where eligibility was received retroactively, up to a maximum of 180 days.

The same page sets a shorter clock for fixes. Corrected claims must be submitted within 60 days of the explanation of payment (EOP), or 180 days from the date of service, whichever is later. A review request for a claim decision is due within 60 calendar days of the EOP or remittance notice, and CountyCare lists timely filing, contract rate or payment, duplicate claim and authorization as denial reasons that can be reviewed.

Electronic billers have the same timely filing requirement as paper billers, and CountyCare says providers must monitor their error reports and proof of payment to confirm every claim was accepted. In practice that means a daily check of the 277CA and the Availity reports, not a monthly one.

How is a Cook County Health claim different from a private academic hospital claim?

Cook County Health runs John H. Stroger, Jr. Hospital and Provident Hospital, and publishes its own accepted-plan guide, so contracting and payer mix differ from UChicago Medicine or Rush. Stroger describes itself as a 450-bed teaching hospital and the hub for specialty care in the system, with an emergency room that treats approximately 120,000 adults and children a year.

The system's own billing page says it will not deny services based on ability to pay but that federal rules require it to send bills to all patients, and that an uninsured patient who does not apply for financial assistance owes the full bill. It points Cook County residents to CareLink, a free program that helps cover treatment at Cook County Health facilities, and states that the Illinois Hospital Uninsured Patient Discount Act is the discount program for uninsured Illinois residents who live outside Cook County. That split by county of residence is unusual, and it changes which application a patient is steered to.

The January 2026 CCH accepted-insurance guide has details a payer contracting team will care about. Blue Cross Blue Shield HMO appears only for IPA 490 Cook Medical Call Group, Illinois Medicaid and Indiana Medicaid are listed, and Medicare, several Medicare Advantage plans, Ambetter of Illinois and Molina Marketplace appear alongside Aetna, Cigna and UnitedHealthcare lines. The guide says it is subject to change and tells staff to confirm eligibility by calling the number on the member card.

None of this replaces the contract. It tells you what to ask for when a denial arrives, and where a public system's rules sit next to a private one. For network and rate work, see payer contracting and Blue Cross Blue Shield billing.

Which Chicago hospitals are Level I trauma centers, and why does that matter for billing?

At least two Chicago systems state Level I status on their own pages: Cook County Health's Stroger Hospital says it is home to one of the busiest Level 1 trauma centers in the nation, and UChicago Medicine says it is designated a Level 1 Adult Trauma Center by the Illinois Department of Public Health and began Level 1 adult care on May 1, 2018. UChicago Medicine also describes a Level 1 Pediatric Trauma Center.

A January 2015 IDPH feasibility study counted six Level I hospitals in Chicago: Lurie Children's, Cook County, Illinois Masonic, Mt. Sinai, Northwestern Memorial and the University of Chicago Comer. That list is more than ten years old and designations change, so treat it as history. IDPH publishes the current list as an interactive map by region on its Trauma Centers by Region page.

For billing, a trauma admission is where facility and professional claims diverge. The hospital bills on the UB-04 and the trauma surgeons, radiologists and anesthesiologists often bill separately on the CMS-1500. When any of those groups is out of network at an in-network hospital, the Illinois notices below and the federal rules decide whether the patient can be balance billed, so confirm each group's network status before the first statement goes out. Our hospital and facility billing work checks the institutional side of that split.

What do Chicago hospital notices say about Illinois balance billing?

UChicago Medicine's notice says Illinois law may protect a patient with a plan overseen by the State of Illinois from balance billing for anesthesiology, emergency, laboratory, pathology or radiology services by an out-of-network provider at an in-network hospital or ambulatory surgical center. Rush's notice describes a related Illinois rule for radiology, anesthesiology, pathology, emergency physician or neonatology services when network services are unavailable at a participating hospital or surgery center.

Both notices give the Illinois Department of Insurance Office of Consumer Health Insurance, toll-free 877-527-9431, as the contact, and both pair the Illinois text with the federal No Surprises Act paragraph. The federal notice for the same hospitals lists more groups, including assistant surgeon, hospitalist and intensivist services in Rush's version. The two lists do not match, which is the practical reason a radiology or anesthesia group in Chicago should keep both on file. For the statute, the arbitration steps and the self-funded split, use the Illinois page and the state surprise billing laws guide. For disputes, see out-of-network billing and IDR and our radiology billing page.

Where do Chicago Medicare claims go?

Chicago Medicare Part A and B claims route to the Illinois contractor, National Government Services in Jurisdiction 6, as shown in the CMS list of contractors by state. Nothing about Medicare processing differs between Chicago and the rest of Illinois, so the filing limit and contractor details stay on the Illinois page and in our Medicare guide.

How we handle billing for Chicago groups and facilities

We work with Chicago hospitals, emergency departments, urgent care networks and large groups remotely. We do not have an office or staff in Chicago; our US registered office is in Richmond, KY, and the team works from offices in Vancouver, BC, Dubai, UAE and Islamabad, PAK.

For out-of-network reimbursement we run open negotiation and dispute submissions end to end, with eligibility assessment, deadline management and documentation checks, under federal IDR and applicable state pathways. On facility claims we prepare UB-04 claims with bill type, revenue code and patient status checks. Claims go out within 24 hours of charge entry and denials are worked within 48 hours. To talk through a Cook County payer mix, book a call.