Ind. Code § 34-18-8-5

Sec. 5. Notwithstanding section 4 of this chapter, a claimant may commence an action in court for malpractice without the presentation of the claim to a medical review panel if the claimant and all parties named as defendants in the action agree that the claim is not to be presented to a medical review panel. The agreement must be in writing and must be signed by each party or an authorized agent of the party. The claimant must attach a copy of the agreement to the complaint filed with the court in which the action is commenced.