(a) An individual or group accident and health insurance policy that is delivered, issued for delivery, or renewed in this state, including a policy issued by a corporation operating under Chapter 842, or a self-funded or self-insured welfare or benefit plan or program, to the extent that regulation of the plan or program is not preempted by federal law, that provides coverage for a child of an insured or group member, on payment of a premium, must provide coverage for:
(1) each grandchild of the insured or group member if the grandchild is:
(A) unmarried;
(B) younger than 25 years of age; and
(C) a dependent of the insured or group member for federal income tax purposes at the time application for coverage of the grandchild is made; and
(2) each child for whom the insured or group member must provide medical support or dental support, if the policy provides dental coverage, under an order issued under Chapter 154, Family Code, or enforceable by a court in this state.
(b) Coverage for a grandchild of the insured or group member may not be terminated solely because the grandchild is no longer a dependent of the insured or group member for federal income tax purposes.