Without additional capital or additional surplus, an authorized insurer is also authorized:
(1) If a life insurer, to grant annuities or issue funding agreements;
(2) If a health insurer, to insure against congenital defects, as defined in § 906(a)(12) of this title;
(3) If a casualty insurer, to transact also health insurance. Except, that this provision shall not apply to a domestic insurer authorized to transact casualty insurance pursuant to § 511(a)(1) of this title.