HCR Update from Mark Sanna: Three of the biggest U.S. health insurers said they plan to keep offering some benefits now required under the federal health overhaul legislation, even if the Supreme Court strikes down the entire law. Humana Inc., Aetna Inc. and UnitedHealth Group Inc. all said they would continue to allow young people to stay on their parents' plans until the age of 26, offer a third-party appeals process for coverage denials, and provide preventive benefits such as immunizations without any out-of-pocket expense for consumers.