Colo. Rev. Stat. § 8-42-126
For the purposes of articles 40 to 47 of this title 8, rules promulgated pursuant to articles 40 to 47 of this title 8, and any orders of the division and office of administrative courts in the department of personnel, monetary benefits or penalties required to be paid to an injured worker are deemed paid on the date the payment is received by or delivered to the intended payee; except that payment delivery attempted through the United States postal service is deemed paid three days after the date of the postmark if the payment is addressed to the payee's last-known address reported to the division and postmarked at least three business days before the date the payment is due.
C.R.S. § 8-42-126
Section 13(2)(a) of chapter 384 (HB 21-1050), Session Laws of Colorado 2021, provides that the act adding this section applies to workers' compensation claims pending or filed on or after September 7, 2021.