668.5  Right of contribution.
  1.  A right of contribution exists between or among two or more persons who are liable upon the same indivisible claim for the same injury, death, or harm, whether or not judgment has been recovered against all or any of them. It may be enforced either in the original action or by a separate action brought for that purpose. The basis for contribution is each person’s equitable share of the obligations, including the share of fault of a claimant, as determined in accordance with section 668.3.
  2.  Contribution is available to a person who enters into a settlement with the claimant only if the liability of the person against whom contribution is sought has been extinguished and only to the extent that the amount paid in settlement was reasonable.
  3.  Contractual or statutory rights of persons not enumerated in section 668.2 for subrogation for losses recovered in proceedings pursuant to this chapter shall not exceed that portion of the judgment or verdict specifically related to such losses, as shown by the itemization of the judgment or verdict returned under section 668.3, subsection 8, and according to the findings made pursuant to section 668.14, subsection 3, and such contractual or statutory subrogated persons shall be responsible for a pro rata share of the legal and administrative expenses incurred in obtaining the judgment or verdict.
  4.  Subrogation payment restrictions imposed pursuant to subsection 3 apply to settlement recoveries, but only to the extent that the settlement was reasonable.
84 Acts, ch 1293, §5; 87 Acts, ch 157, §7