No hospital or medical service corporation contract which provides maternity benefits for a person covered continuously from conception shall be issued, amended, delivered, or renewed in this state on or after January 1, 1977, if it contains any exclusion, reduction, or other limitations as to coverage, deductibles, or coinsurance provisions as to involuntary complications of pregnancy, unless such provisions apply generally to all benefits paid under the contract. If a fixed amount is specified in such contract for surgery, the fixed amounts for surgical procedures involving involuntary complications of pregnancy shall be commensurate with other fixed amounts payable for procedures of comparable difficulty and severity. In a case where a fixed amount is payable for maternity benefits, involuntary complications of pregnancy shall be deemed an illness and entitled to benefits otherwise provided by the contract. Where the contract contains a maternity deductible, the maternity deductible shall apply only to expenses resulting from normal delivery and cesarean section delivery; however, expenses for cesarean section delivery in excess of the deductible shall be treated as expenses for any other illness under the contract. This section shall apply to all hospital or medical service corporation contracts except any group hospital or medical service corporation contract made subject to an applicable collective-bargaining agreement in effect before January 1, 1977.