Indiana Code Title 31. Family Law and Juvenile Law § 31-18.5-6-11

Sec. 11. (a) If section 13 of this chapter does not apply, upon petition, an Indiana tribunal may modify a child support order issued in another state which is registered in Indiana if, after notice and hearing, the tribunal finds that:

(b) Modification of a registered child support order is subject to the same requirements, procedures, and defenses that apply to the modification of an order issued by an Indiana tribunal and the order may be enforced and satisfied in the same manner.

(c) An Indiana tribunal may not modify any aspect of a child support order that may not be modified under the law of the issuing state, including the duration of the obligation of support.  If two (2) or more tribunals have issued child support orders for the same obligor and same child, the order that controls and must be so recognized under IC 31-18.5-2-7 establishes the aspects of the support order which are nonmodifiable.

(d) In a proceeding to modify a child support order, the law of the state that is determined to have issued the initial controlling order governs the duration of the obligation of support.  The obligor's fulfillment of the duty of support established by that order precludes imposition of a further obligation of support by an Indiana tribunal.

(e) On the issuance of an order by an Indiana tribunal modifying a child support order issued in another state, the Indiana tribunal becomes the tribunal having continuing, exclusive jurisdiction.

(f) Notwithstanding subsections (a) through (e) and IC 31-18.5-2-1(b), an Indiana tribunal retains jurisdiction to modify an order issued by an Indiana tribunal if: