Hawaii Revised Statutes Division 2. Business § 432:1-601

All individual and group hospital or medical service plan contracts, delivered or issued for delivery in this State after May 8, 1968, that provide that coverage of a dependent child shall terminate upon attainment of the limiting age for dependent children specified in the contract shall also provide in substance that attainment of the limiting age shall not operate to terminate the coverage of the child while the child is and continues to be both:

provided that proof of the child's incapacity and dependency is furnished to the hospital service or medical indemnity association by the policyholder, subscriber, or employee within thirty-one days of the child's attainment of the limiting age and subsequently as may be required by the association.