HB 2641 prohibits health maintenance organizations and insurers from requiring preauthorization for certain health care services, including emergency care, primary care, outpatient mental health treatment, pediatric hospice services, and cancer treatments. The bill also ensures that preauthorization approvals for chronic health conditions do not expire unless standard treatments change. Additionally, it restricts insurers from denying or reducing payments for services that do not require preauthorization, unless fraud or improper billing is suspected.