I once ask Calsurance about a B rated company and would they cover it and they wrote back "
The only limitation in the coverage related to an AM Best rating involves claims alleging insolvency or financial inability to pay a claim. The program limits this coverage to carriers rated A- or better at the time of placement. If the claims is for any other reason than insolvency, the AM Best rating is not a factor.
The wording in the policy is consistent with most major E&O programs but you are correct, there are a few in the marketplace which will not provide any coverage for claims based on a certain AM Best rating."
