The primary concern: It’s not the potential loss of patients with private Obamacare insurance that worries hospitals the most. It’s the loss of patients with Medicaid coverage.

Even though state Medicaid programs pay hospitals less than Medicare or private insurers, it’s still been better than nothing. That’s why state hospital associations have aggressively lobbied for Medicaid expansion in Republican states that haven’t embraced it.

Dennis Dahlen, chief financial officer of Banner Health in Phoenix, recently said there could be “dire consequences” if Medicaid expansion is rolled back and if Republicans move toward Medicaid block grants. That would threaten revenue immediately and lead to more uninsured patients walking into the emergency room.

“Our biggest exposure and biggest concern is Medicaid funding,” Dahlen said. About 13% of Banner’s patient revenue comes from Medicaid.