; and (B) formats for bills and invoices that clearly distinguish between charges for air transportation services and charges for non-air transportation services; (2) options, best practices, and identified standards to prevent instances of balance billing such as improving network and contract negotiation, dispute resolution between health insurance and air medical service providers, and explanation of insurance coverage and subscription programs to consumers; (3) steps that can be taken by State legislatures, State insurance regulators, State attorneys general, and other State officials as appropriate, consistent with current legal authorities regarding consumer protection; (4) recommendations made by the Comptroller General study, GAO–17–637, including what additional data from air ambulance providers and other sources should be collected by the Department of Transportation to improve its understanding of the air ambulance market and oversight of the air ambulance industry for the purposes of pursuing action related to unfair or deceptive practices or unfair methods of competition, which may include— (A) cost data; (B) standard charges and payments received per transport; (C) whether the provider is part of a hospital-sponsored program, municipality-sponsored program, hospital-independent partnership (hybrid) program, or independent program; (D) number of transports per base and helicopter; (E) market shares of air ambulance providers inclusive of any parent or holding companies; (F) any data indicating the extent of competition among air ambulance providers on the basis of price and service; (G) prices assessed to consumers and insurers for air transportation and any non-transportation services provided by air ambulance providers; and (H) financial performance of air ambulance providers; (5) definitions of all applicable terms that are not defined in statute or regulations