Whether the appeal was admissible absent a decision on opposition or another appealable decision.
The appeal was inadmissible because the appellant challenged a letter of 12 October 2012 rather than an appealable opposition decision.
Under Art. 52(1) LPGA, administrative decisions must first be contested by objection unless the objection route is unavailable; under Art. 56(1) LPGA, only opposition decisions or decisions not subject to objection are appealable. The challenged correspondence was not such a decision.