Ariz. Admin. Code § 20-5-102
In this Article, unless the context otherwise requires:
"Act" means the Arizona Workers' Compensation Act, A.R.S. Title 23, Ch. 6, Articles 1 through 11.
"Authorized representative" means an individual authorized by law to act on behalf of a party who files with the Commission a written instrument advising of the individual's authority to act on behalf of the party.
"Carrier" or "insurance carrier" means the state compensation fund and every insurance carrier authorized by the Arizona Department of Insurance to underwrite workers' compensation insurance in Arizona.
"Claimant" means an employee who files a claim for workers' compensation.
"Filing" means actual receipt of a report, document, instrument, videotape, audiotape, or other written matter at a Commission office during office hours as set forth in R20-5-103.
"Physician" means a licensed physician or other licensed practitioner of the healing arts.
"Self-insured employer" means an employer or workers' compensation pool granted authority by the Commission to self- insure for workers' compensation.
"Uninsured employer" or "noncomplying employer" means an employer that is subject to and fails to comply with A.R.S. §§ 23-961 or 23-962.
"Working days" means all days except Saturdays, Sundays, and state legal holidays.
Ariz. Admin. Code § R20-5-102