Exceptions.

The net income of a cooperative health care association organized under s. 185.981, or of a service insurance corporation organized under ch. 613, that is derived from a health maintenance organization, as defined in s. 609.01 (2), or a limited service health organization, as defined in s. 609.01 (3), is the net income that would be determined if the cooperative health care association or service insurance corporation were subject to federal income taxation and as if that income were that of an insurance company.