Idaho Code § 72-806
A workman shall receive written notice within fifteen (15) days of any change of status or condition including, but not limited to, the denial, reduction or cessation of medical and/or monetary compensation benefits, which directly or indirectly affects the level of compensation benefits to which he might presently or ultimately be entitled. If any change in compensation benefits is based upon a medical report or medical reports from any physician or any other practitioner of the healing arts, a copy of such report shall be attached to the written notice which the workman shall receive. The industrial commission shall by rule and regulation, determine by whom the notice shall be given and the form for such notice. In the absence of a rule governing a particular situation, the employer's insurer, or in the case of self-insurers, the employer, shall be responsible for giving the notice required herein.
Idaho Code § 72-806