Miss. Code § 83-41-205
Any individual hospital or medical service plan contract or any individual hospital or medical expense insurance policy delivered or issued for delivery in this state after September 12, 1972, which provides that coverage of a dependent child shall terminate upon attainment of the limiting age for dependent children specified in the contract or policy, shall also provide in substance that attainment of such limiting age shall not operate to terminate the coverage of such child while the child is and continues to be both (a) incapable of self-sustaining employment by reason of having an intellectual disability or a physical disability, and (b) chiefly dependent upon the subscriber or policyholder for support and maintenance, provided proof of such incapacity and dependency is furnished to the hospital or medical service plan corporation or insurer by the subscriber or policyholder within thirty-one (31) days of the child's attainment of the limiting age and subsequently as may be required by the corporation or insurer, but not more frequently than annually after the two-year period following the child's attainment of the limiting age.
Any insurer or hospital service plan corporation continuing dependent coverage beyond the limiting age for dependent children as prescribed by this section, shall have the right to charge the standard adult premium for such coverage.
Miss. Code § 83-41-205