The parity law requires that mental health coverage, including for addiction treatment, in employer-sponsored health plans be treated equally to that for other medical conditions. The law does not mandate coverage for mental health and addiction care, but if it is included in a company’s health plan, insurance companies must provide parity coverage. And now, with the Supreme Court’s decision to uphold the Affordable Care Act (ACA), parity’s reach will be extended, benefiting many more mentally ill individuals when all the law’s provisions are in place. For example, coverage of mental illness, including substance abuse disorders, is required as part of the “core benefits” package in the state insurance exchanges established by the ACA.