IL HB1770

Requires insurance policies to cover medically necessary treatments for genetic, rare, unknown or unnamed, and unique conditions, specifically including Ehlers-Danlos syndrome and altered drug metabolism

Mandates prescription drug coverage include opioid alternatives, medicines on the World Health Organization's Model List of Essential Medicines, custom-made medications, and medical food

Prohibits insurers from requiring pre-approval for patients with rare metabolism conditions who need higher medication doses than standard quantity limits allow

Shifts the burden of proving medical necessity away from the insured for claim rejections, preauthorization requests, and appeals related to these coverage requirements

Applies to all insurance policies amended, delivered, issued, or renewed in Illinois after the act takes effect