"Children's Health Security Act"; requiring the commissioner of human+ services to establish the children's health security program, specifying +eligibility requirements and covered services; enumerating application procedures+ and providing for the delivery of services through commissioner contracts+ with health maintenance organizations (HMO), community integrated service +networks (CISN) and accountable provider networks, authorizing the +commissioner to contract with a private sector entity to administer and manage the +contracts and requiring commissioner contracting with health care and social +service providers on a fee for service basis to provide program enrollees +with services available only under medical assistance (MA) home and community based+ waivers; requiring the commissioner in consultation with a health care actuary+ to establish the method and amount of payments for services; requiring +certain assistance to applicants and the commissioner to designate an +ombudsperson to advocate for children enrolled in the program and to require +participating health plan companies and participating providers to submit data +required for assessing enrollee satisfaction, quality of care, cost and use of +services; increasing the tax on cigarettes and tobacco products and imposing a +floor stocks tax to fund the program, creating a children's health security+ account for the deposit of receipts; requiring the commissioner to develop an implementation plan for the program for presentation to the +legislature by a certain date, requiring the seeking of federal waivers and approvals +necessary for implementation purposes and the adoption of rules(mk)