The claimant sought payment for accounting invoices related to calculating IRBs. The insurer argued that the accounting report was not reasonable or necessary for calculating IRBs. Vice Chair McGee found the accounting report costs were not payable. The claimant had only one source of income, and the IRB calculation required a simple deduction for short-term disability payments. No expertise was required to interpret the documentation. Obtaining the accounting report was not reasonable or necessary in the circumstances.