Iowa Code § 602.1612

1. Justices of the supreme court, judges of the court of appeals, district judges, and district associate judges who are retired by reason of age or who are drawing benefits under section 602.9106, and senior judges who have retired under section 602.9207 or who have relinquished senior judgeship under section 602.9208, subsection 1, may with their consent be assigned by the supreme court to temporary judicial duties on a court in this state if the assignment is deemed necessary by the supreme court to expedite the administration of justice.

2. A retired justice or judge shall not engage in the practice of law unless the justice or judge files an election to practice law with the clerk of the supreme court. Upon electing to practice law, the justice or judge is ineligible for assignment to temporary judicial duties at any time.

3. While serving under temporary assignment, a retired justice or judge shall be paid the compensation and expense reimbursement provided by law for justices or judges on the court to which assigned, but shall not receive annuity payments under the judicial retirement system and a district associate judge covered under chapter 97B shall receive monthly benefits under that chapter only if the district associate judge has attained the age of seventy years.