Requires each medical malpractice insurer to file its underwriting rules, guidelines, criteria, standards, or other information the insurer uses to underwrite medical malpractice coverage. However, an insurer is excluded from this requirement if the insurer is ordered into rehabilitation under chapter 48.31 or 48.99 RCW.

Requires every filing of underwriting information to identify and explain: (1) The class, type, and extent of coverage provided by the insurer;

(2) Any changes that have occurred to the underwriting standards; and

(3) How underwriting changes are expected to affect future losses.