Buffy, if you or anyone else has ever been dropped from their insurance plan strictly because they got sick and filed a claim, then you have a case against them. It is illegal in all 50 states to do that. If I am wrong with that statement, then so is Attorney Richard Giller, one of the nation's leading experts on insurance coverage. I've read several articles citing him on this subject.
The troop death count just doubled in Afghanistan recently......
You are looking at at the issue of rescission incorrectly. Rescission happens when an insured gets sick and then the insurer combs through their application to find an inconsequential error i.e, an indisclosed or forgotten back strain, an abnormal pap smear etc. The insurance company will then rescind the policy even if the new illness has nothing to do with undisclosed or forgotten condition. This is extremely common. The insurance company is not rescinding the policy because the insured got sick but instead is trying to find another inconsequential excuse to rescind the policy because they don't want to pay for the new illness or injury. My understanding is that under HCR rescissions can only occur if the insured commits fraud on an insurance application and not just an error.