“I knew that once I did that my life would be different,” he said. “I wouldn’t be getting any more calls from recruiters for the health industry. It was the scariest thing I have done in my life. But it was the right thing to do.”

Mr. Potter says he liked his colleagues and bosses in the insurance industry, and respected them. They are not evil. But he adds that they are removed from the consequences of their decisions, as he was, and are obsessed with sustaining the company’s stock price  which means paying fewer medical bills.

One way to do that is to deny requests for expensive procedures. A second is “rescission”  seizing upon a technicality to cancel the policy of someone who has been paying premiums and finally gets cancer or some other expensive disease. A Congressional investigation into rescission found that three insurers, including Blue Cross of California, used this technique to cancel more than 20,000 policies over five years, saving the companies $300 million in claims.

Image Wendell Potter Credit... Emily Potter

As The Los Angeles Times has reported, insurers encourage this approach through performance evaluations. One Blue Cross employee earned a perfect evaluation score after dropping thousands of policyholders who faced nearly $10 million in medical expenses.

Mr. Potter notes that a third tactic is for insurers to raise premiums for a small business astronomically after an employee is found to have an illness that will be very expensive to treat. That forces the business to drop coverage for all its employees or go elsewhere.

All this is monstrous, and it negates the entire point of insurance, which is to spread risk.

The insurers are open to one kind of reform  universal coverage through mandates and subsidies, so as to give them more customers and more profits. But they don’t want the reforms that will most help patients, such as a public insurance option, enforced competition and tighter regulation.