There seems to be no end to the tricks insurers will come up with in order to suck more money out of Medicare. According to the findings of the Office of Inspector General of the Department of Health and Human Services, it analyzed 20 companies and investigators found that one received about 40% of the questionable payments, or $3.7 billion, while enrolling only 22% of Medicare Advantage customers. It wouldn’t name the company, but BMO Capital Market looked at federal data and showed that the enrollment share closely matches UnitedHealth Group Inc. during the period the investors looked at.