Question juridique clé
Whether the insured person had standing to appeal the cantonal order requiring an advance of costs.
Solution extraite
No legally protected interest existed because the challenged cost-advance order did not practically affect her rights; any objections to the expert appointment could still be raised against the final decision.
Motifs extraits
The legal question over the cost advance had no independent practical significance. The alleged bias reasons were material, not formal recusation grounds, and could be reviewed later with the final decision; therefore no irreparable prejudice or present interest was shown.