"Interested party" with respect to a claim for benefits means the claimant, the claimant's last regular employer, the employer whose account is chargeable for experience rating purposes, the cost reimbursement employer who may be billed for any portion of benefits claimed, and the director or an authorized representative of any of them; "interested party" with respect to proceedings involving employer liability means the employer and the director or an authorized representative.
Idaho Code § 72-1323