Indiana Code Title 16. Health § 16-36-1-6

Sec. 6. (a) A representative authorized to consent to health care for another under section 5(a)(2), 5(a)(3), 5(a)(4), 5(a)(5), 5(a)(6), 5(b)(2), or 5(b)(3) of this chapter who for a time will not be reasonably available to exercise the authority may delegate the authority to consent during that time to another representative not disqualified under section 9 or 9.5 of this chapter.  The delegation:

(b) Unless the writing expressly provides otherwise, the delegate may not delegate the authority to another representative.

(c) The delegate may revoke the delegation at any time by notifying orally or in writing the delegate or the health care provider.