Ariz. Rev. Stat. § 23-947 – Time within which hearing must be requested; definition

A. A hearing on any question relating to a claim shall not be granted unless the employee has previously filed an application for compensation within the time and in the manner prescribed by section 23-1061 and the request for a hearing is filed within ninety days after the notice sent under section 23-1061, subsection F or within ninety days of notice of a determination by the commission, insurance carrier or self-insuring employer under section 23-1047 or 23-1061, except that an employer who is subject to and fails to comply with section 23-961 or 23-962 must file a request for a hearing within thirty days of notice of a determination by the commission, or within ten days of all other awards issued by the commission.
B. As used in this section, "filed" means that the request for a hearing is in the possession of the commission. Failure to file with the commission within the required time by a party means that the determination by the commission, insurance carrier or self-insuring employer is final and res judicata to all parties. The industrial commission or any court shall not excuse a late filing unless any of the following applies:
1. 1. The person to whom the notice is sent does not request a hearing because of justifiable reliance on a representation by the commission, employer or carrier. In this paragraph, "justifiable reliance" means that the person to whom the notice is sent has made reasonably diligent efforts to verify the representation, regardless of whether the representation is made pursuant to statutory or other legal authority.
2. 2. At the time the notice is sent the person to whom it is sent is suffering from insanity or legal incompetence or incapacity, including minority.
3. 3. The person to whom the notice is sent shows by clear and convincing evidence that the notice was not received.
C. The late filing shall not be excused under subsection B of this section if the person to whom the notice is sent or the person's legal counsel knew or, with the exercise of reasonable care and diligence, should have known of the fact of the notice at any time during the filing period.