Three of the nation's largest health insurers announced that young adults can remain under their parents' policies until Sept. 23, when a new federal law guarantees them coverage. UnitedHealthcare, WellPoint, Inc. and Humana Inc. said they will not wait until President Obama's new healthcare reforms take effect. They include provisions allowing young adults to remain under their parents' health plans until age 26. Other companies may follow their lead, federal officials said.
