Question juridique clé
Whether the invalidity insurance had to cover the more expensive binaural hearing aid system of indicator level 4.
Solution extraite
Yes. In this case the chosen higher-cost system remained simple and suitable because cheaper devices would not achieve adequate integration and the price difference was not disproportionate.
Motifs extraits
Aids must be necessary, appropriate, and financially reasonable, but not merely the cheapest solution. Given the insured's pronounced hearing impairment, professional role, and medically supported benefits, the more expensive device was justified.