Immunity from liability

(a) A person who relies in good faith upon a person's representation that he is the person named as agent in a health care power of attorney is not subject to civil or criminal liability or disciplinary action for recognizing the agent's authority. (b) A health care provider or nursing care provider who in good faith relies on a health care decision made by an agent or successor agent is not subject to civil or criminal liability or disciplinary action on account of relying on the decision. (c) An agent who in good faith makes a health care decision pursuant to a health care power of attorney is not subject to civil or criminal liability on account of the substance of the decision.