Whether the insurer's reconsideration rendered the appeal moot and the case should be struck from the docket.
The insurer validly reconsidered its opposition decision and accepted the remaining reimbursement claim, so the appeal became moot and had to be struck from the docket.
Under Art. 53 para. 3 LPGA, an insurer may reconsider a challenged decision until it files its response to the appeal authority; once it fully accepted the remaining claim, there was no longer a live dispute.