(a) The contractor must administer the family cost share system in compliance with the requirements in this title, HHSC policy concerning ECI, and the contract.(b) In compliance with 34 CFR §303.510(a) and (b) and §303.203(b)(1), IDEA Part C funding is the payor of last resort for early childhood intervention services. The contractor must:(1) establish third-party billing systems, determine client eligibility for all third-party reimbursement sources, and complete and submit reimbursement requests to corresponding third-party sources, including private insurance, Medicaid programs, CHIP, and TRICARE;(2) coordinate funding sources for services required under IDEA Part C; and(3) use other funding for which the clients are eligible before billing services to the HHSC contract, which includes distribution of IDEA Part C funds.