Kernrechtsfrage
Whether the revision request was filed within 90 days of discovering the revision ground under Art. 123(2)(a) LTF.
Extrahierter Entscheid
The insurer had sufficient knowledge of the alleged new fact after receiving its medical advisor's reports, so the 90-day period started then.
Extrahierte Begründung
A revision ground is discovered once the applicant knows it with sufficient certainty to raise it, even without full proof. The insurer knew enough from the reports received on 31 January 2013; waiting for a further opinion was unnecessary.