HB 4735
TRANSPARENCY IN DOWNCODING ACT
TL;DR
Illinois HB 4735, the Transparency in Downcoding Act, targets the practice of 'downcoding' in healthcare billing, where insurers or their AI tools reduce the billing code submitted by a provider to a lower-paying one. The bill would force health insurers to disclose when and how they downcode claims, including any algorithms or AI systems used to make those decisions.
How This Might Impact Your Business
Health insurers operating in Illinois would need to disclose to providers when a claim has been downcoded and explain the reasoning, including whether AI or automated systems were involved.
Insurance carriers using AI claims-review tools (Optum, Cohere Health, Cotiviti, and similar vendors) would face new transparency obligations about how their algorithms reach coding decisions.
Hospitals, physician groups, and billing companies gain a clearer paper trail to dispute downcoded claims, potentially recovering revenue currently lost to automated adjustments.
Healthcare AI vendors selling claims-review or coding-optimization software to Illinois insurers may need to make their decision logic auditable and explainable.
Compliance scope is limited to Illinois-regulated health plans, so self-funded ERISA plans likely fall outside the bill's reach.
Bill is newly introduced with a co-sponsor just added, so specific penalty structures and effective dates will be shaped in committee.
Expect pushback from the insurance lobby, which means the disclosure requirements could be narrowed before any final vote.
What Should You Do
If you run a hospital or physician practice in Illinois, ask your revenue cycle team to quantify current downcoding losses so you can support the bill with real numbers and prepare to recover revenue if it passes.
If you sell AI claims-review or coding software to insurers, have your product and legal teams document how your algorithms make coding decisions and prepare an explainability summary.
Health insurers should ask compliance and IT to inventory every automated tool touching claim codes and assess what disclosures would look like operationally.
Track the bill through the Illinois House Insurance Committee and watch for amendments that narrow the AI disclosure language.
Brief your government affairs lead now so you can submit witness slips or testimony when the first committee hearing is scheduled.
Who It Affects
Status Timeline
introduced
Added Chief Co-Sponsor Rep. Jeff Keicher
May 5, 2026