(1) If no order or award of compensation or compensation scheme has been entered, the employer, insurer or group self-insurer may discontinue or reduce benefits by sending a certificate by certified mail to the employee and to the board, together with any information on which the employer, insurer or group self-insurer relied to support the discontinuance or reduction. The employer may discontinue or reduce benefits no earlier than 21 days from the date the certificate was mailed to the employee , except that benefits paid pursuant to section 212, subsection 1 or section 213, subsection 1 may be discontinued or reduced based on the amount of actual documented earnings paid to the employee during the 21-day period if the employer files with the board the documentation or evidence that substantiates the earnings and the employer only reduces or discontinues benefits for any week for which it possesses evidence of such earning. The certificate must advise the employee of the date when the employee's benefits will be discontinued or reduced, as well as other information as prescribed by the board, including the employee's appeal rights.

(2) If an order or award of compensation or compensation scheme has been entered, the employer, insurer or group self-insurer shall petition the board for an order to reduce or discontinue benefits and may not reduce or discontinue benefits until the matter has been finally resolved through the dispute resolution procedures of this Act, any appeal proceedings have been completed and an order of reduction or discontinuance has been entered by the board. Upon the filing of a petition, the employer may discontinue or reduce the weekly benefits being paid pursuant to section 212, subsection 1 or section 213, subsection 1 based on the amount of actual documented earnings paid to the employee after filing the petition. The employer shall file with the board the documentation or evidence that substantiates the earnings and the employer may discontinue or reduce weekly benefits only for weeks for which the employer possesses evidence of such earnings.