Question juridique clé
Whether the 2nd radiology emergency-measures convention was valid without Federal Council approval and therefore barred reimbursement.
Solution extraite
The convention was not exempt from approval; it required Federal Council approval and could not bind the parties without it.
Motifs extraits
The supplements were a tariff addition, not a mere correction of the tariff structure. The neutrality-of-costs clause exempted only under-year structural corrections, whereas the convention lasted 18 months and changed prices rather than tariff points.