The Classification Plan, including codes of an authorized rating organization which is the current and latest Classification Plan on file with the Commissioner, shall be followed by all insurers when transacting workers' compensation insurance in the State of Georgia.
Ga. Comp. R. & Regs. R. 120-2-37-.06
O.C.G.A. Secs. 33-2-9, 33-9-20, 33-9-21, 34-9-133.