WASHINGTON -- Democrats are poised Tuesday to push health-overhaul legislation through the influential Senate Finance Committee, but they face new hurdles from insurers ratcheting up concerns about the sweeping bill.

A report released Monday by America's Health Insurance Plans, an industry trade group, said the Finance Committee bill would impose stiff costs on consumers. Among other things, the report said a family health-insurance policy that costs $12,300 today would increase to $25,900 on average by 2019 under the bill,...