Establishes the "Designated Health Care Decision-Maker Act", which authorizes certain persons to make health care decisions for certain incapacitated persons

HB 1886 establishes the "Designated Health Care Decision-Maker Act," allowing Missouri adults to formally designate a specific person to make health care decisions for them if they become incapacitated (unable to make decisions due to physical or mental condition). This designated person, distinct from existing legal roles like guardians or durable power of attorney agents, must act in the patient's "best interests" by ensuring equal access to care without discrimination based on disability. The bill defines key terms like "incapacitated," "best interests" (including promoting the highest attainable health standard), and "health care" to guide decision-making in hospitals, nursing facilities, or other care settings. It does not replace existing advance directives but creates a new, standardized process for appointing a decision-maker.