Requires health insurance and Medicaid coverage for screening, prevention, and treatment services of behavioral health issues affecting children.

S 4018 requires health insurance plans and Medicaid to cover screening, prevention, and treatment services for behavioral health issues in children under 18. It mandates that providers can bill for these services using an "at-risk diagnosis" (which considers factors like family circumstances without requiring a formal mental health diagnosis) and alternative codes like Social Determinants of Health Z-codes. The coverage must be provided at the same level as other medical services for all covered children. This applies to all health insurance carriers, the State Health Benefits Program, the School Employees' Health Benefits Program, and New Jersey's Medicaid program (NJ FamilyCare).