The bill introduces a new section to chapter 18.130 RCW that prohibits healthcare providers from administering puberty-blocking medications, cross-sex hormones, or gender transition surgeries to minors for the purpose of altering their gender or sex appearance or perception. Specifically, it bans practices such as prescribing hormone therapies that exceed normal levels for the minor's age and sex, performing sterilization surgeries, and any surgeries that create genitalia inconsistent with the minor's biological sex. The bill outlines that these prohibitions apply unless the minor has a medically verifiable disorder of sex development or is undergoing treatment for conditions that necessitate such interventions.

Additionally, the bill clarifies that certain services are exempt from these prohibitions, including those for minors with diagnosed disorders of sexual development, tapering off hormone treatments, and addressing medical issues resulting from prior gender transition procedures. Definitions for "gender," "minor," and "sex" are provided to ensure clarity in the application of the law. Overall, the legislation aims to restrict gender transition-related medical practices for minors while allowing for specific medical exceptions.