Preexisting conditions and essential benefits. Prohibits preexisting condition exclusions in, and use of a preexisting condition to determine a premium for, individual policies of accident and sickness insurance, small employer group health insurance plans, and health maintenance organization contracts. Specifies benefits that must be included in individual and small group policies of accident and sickness insurance and health maintenance organization contracts. Repeals provisions providing for individual and association group accident and sickness insurance policy waivers of coverage. Repeals provisions providing for preexisting condition exclusions in small employer group health insurance plans. Requires the legislative services agency to draft legislation for introduction in the 2020 session of the general assembly to make conforming changes to the Indiana Code.