MT HB727

Requires the Insurance Commissioner to include Plan No. 3 (the State Fund) alongside Plan No. 2 private insurers when measuring workers' compensation market concentration using the Herfindahl-Hirschman Index

Establishes that a Herfindahl-Hirschman Index over 1,800 creates a presumption that reasonable competition does not exist, triggering a mandatory public hearing

Mandates corrective measures when a noncompetitive market is confirmed, including promoting new insurers, limiting large mergers, consumer education, and prohibiting or limiting by at least 50% premiums written by producer agencies to monopoly carriers

Defines "actively engaged" insurers as those with a positive measurable effect on the Herfindahl-Hirschman Index based on NAIC annual market share reports for direct premiums earned

Requires the Commissioner to notify all customers, insurers, and producers participating in workers' compensation when corrective measures are implemented