NPR has a story that begins, "According to a new report by congressional investigators, an insurance company practice of retroactively canceling health insurance is fairly common, and it saves insurers a lot of money."
The story talks about one woman with breast cancer. On the eve of her mastectomy, her insurance was cancelled because she had failed to report previous instances of acne and rapid heart beat.
Another man had his insurance revoked because he hadn't reported gallstones - that he hadn't known about.
He's dead now.
Read more here.