CHICAGO — Predictive modeling among workers compensation insurers is presenting a challenge to self-insured groups, who are facing off with insurers that are offering increasingly competitive pricing.

Washington state’s “Interagency Guideline on Opioid Dosing for Chronic Non-cancer Pain” is among the respected medical guidelines doctors look to for determining appropriate treatment for injured workers.

With increased urine drug screening to monitor patients taking opioid painkillers, doctors also are ordering tests to reveal use of drugs such as cocaine and methamphetamines.

American International Group Inc. underreported its workers compensation premiums years longer than previously reported, if new allegations filed by attorneys seeking to represent employers in several new lawsuits are true.