MA S2599

Requires health insurers, HMOs, and the Group Insurance Commission to cover medically necessary early intervention treatments for port-wine stains in individuals 18 years of age or younger

Covered conditions include nevus flammeus, Sturge-Weber syndrome, and Klippel-Trénaunay syndrome; covered treatments include topical therapies, FDA-approved laser treatments, surgery, and other medical procedures

Defines medically necessary treatment as addressing functional impairments (vision, oral function, mobility), medical complications (inflammation, bleeding, infection, hypertrophy), or significant psychosocial distress, particularly in pediatric patients

Prohibits insurers from imposing more restrictive deductibles, coinsurance, or treatment limits than those applied to other medically necessary services; excludes purely cosmetic treatments

Directs the Center for Health Information and Analysis to review the mandate's impact on health plans and Medicaid, with findings due by January 1, 2026; coverage requirements apply to contracts effective or renewed on or after January 1, 2026