Question juridique clé
Whether the complaint against the appointment of the medical expert was admissible beyond formal grounds of recusal.
Solution extraite
Only formal recusal grounds could be reviewed; objections to the expert's professional competence or general approach were not part of the recusal request.
Motifs extraits
Under Art. 92 BGG, only a separately appealable interlocutory decision on recusal is at issue. Recusal grounds under Art. 36 ATSG and Art. 10 VwVG concern impartiality, not substantive objections to expertise; such concerns belong to the assessment of the expert report.