(a) Each group health insurance policy providing coverage of the type specified in subdivisions (1), (2), (4), (6), (11) and (12) of § 38a-469 delivered, issued for delivery, renewed, amended or continued in this state that provides that coverage of a dependent child of an employee or other member of the covered group shall terminate upon attainment of the limiting age for dependent children specified in the policy shall also provide in substance that attainment of the limiting age shall not operate to terminate the coverage of the child if at such date the child is and continues thereafter to be both (1) incapable of self-sustaining employment by reason of mental or physical handicap, as certified by the child’s physician, physician assistant or advanced practice registered nurse on a form provided by the insurer, hospital service corporation, medical service corporation or health care center, and (2) chiefly dependent upon such employee or member for support and maintenance.

(b) Proof of the incapacity and dependency shall be furnished to the insurer, hospital service corporation, medical service corporation or health care center by the employee or member within thirty-one days of the child’s attainment of the limiting age. The insurer, corporation or center may at any time require proof of the child’s continuing incapacity and dependency. After a period of two years has elapsed following the child’s attainment of the limiting age the insurer, corporation or center may require periodic proof of the child’s continuing incapacity and dependency but in no case more frequently than once every year.