Fla. Stat. § 440.28

Upon a judge of compensation claims’ own initiative, or upon the application of any party in interest, on the ground of a change in condition or because of a mistake in a determination of fact, the judge of compensation claims may, at any time prior to 2 years after the date of the last payment of compensation pursuant to the compensation order the party seeks to modify, or at any time prior to 2 years after the date copies of an order rejecting a claim are mailed to the parties at the last known address of each, review a compensation case in accordance with the procedure prescribed in respect of claims in s. 440.25 and, in accordance with such section, issue a new compensation order which may terminate, continue, reinstate, increase, or decrease such compensation or award compensation. Such new order shall not affect any compensation previously paid, except that an award increasing the compensation rate may be made effective from the date of the injury, and, if any part of the compensation due or to become due is unpaid, an award decreasing the compensation rate may be made effective from the date of the injury, and any payment made prior thereto in excess of such decreased rate shall be deducted from any unpaid compensation, in such manner and by such method as may be determined by the judge of compensation claims.