No, payments from the Iowa Public Retirement Program (IPERS) are considered pension payments, not Required minimum Distributions (RMDs). RMDs rules generally apply to accounts like IRAs and 401(k)s.
TurboTax indicates a return needs to be mailed in if it's not an RMD as Non-RMD distributions require additional documentation to indicate the nature of the payment.
For more details, you can check out TurboTax's community forum and IPERS information.