Nearly 770 business interruption (BI) claims associated with the 9/11 disaster – with a loss exposure of about $12 billion – remain to be settled by insurers, according to a PricewaterhouseCoopers analysis.

They’re the big BI claims. Another 4735 claims worth $4.7 billion have been settled. BI coverage continues to represent the largest portion of claims stemming from 9/11, the PWC report says. It believes 30% ($16.8 billion) of the total loss estimates of $46.5 billion relating to 9/11 are business interruption claims.

PWC director Steve Kessler says calculating a BI loss is difficult under normal circumstances. “Claims that are easier to measure and review by the insurers are generally being paid out.”

Some of the key issues in connection with the BI claims that have not been settled include claims being filed after the physical damage and extra expense claims were concluded, and differing interpretations of policies.