(1) This division applies to the following decisions—(a) a review decision, other than a decision to return a matter to a decision-maker under section 545 ;(b) a decision by an insurer under chapter 3 or 4 , other than—(i) a decision mentioned in section 540 (1) ; or(ii) a decision about an entitlement to additional lump sum compensation under section 193A .
(2) A decision mentioned in subsection (1) (b) to which this division applies is a
"non-reviewable decision" .