In this article, unless the context otherwise requires:

1. "Commission" means the industrial commission of Arizona.

2. "Firefighter" has the same meaning prescribed in Section 23-901.09.

3. "Fire investigator" has the same meaning prescribed in Section 23-901.09.

4. "Fund" means the municipal firefighter cancer reimbursement fund.

5. "Municipal payor" means any of the following:

(a) A workers’ compensation insurer used by a city or town.

(b) A self-insurance program approved pursuant to section 23-961 used by a city or town.

(c) A public agency pool that is established pursuant to Section 11-952.01 and that is used by a city or town.