Section 609.03 - Indication of operations(1) CERTIFICATE OF AUTHORITY. An insurer may apply to the commissioner for a new or amended certificate of authority that limits the insurer to engaging in only the types of insurance business described in sub. (3).(2) STATEMENT OF OPERATIONS. If an insurer is a cooperative association organized under ss. 185.981 to 185.985 , the insurer may apply to the commissioner for a statement of operations that limits the insurer to engaging in only the types of insurance business described in sub. (3).(3) RESTRICTIONS ON OPERATIONS. (a) An insurer that has a new or amended certificate of authority under sub. (1) or a statement of operations under sub. (2) may engage in only the following types of insurance business: 1. As a health maintenance organization.2. As a limited service health organization.3. In other insurance business that is immaterial in relation to, or incidental to, the insurer's business under subd. 1. or 2.(b) The commissioner may, by rule, define "immaterial" or "incidental", or both, for purposes of par. (a) 3. as a percentage of premiums, except the percentage may not exceed 10 percent of the total premiums written by the insurer. (4) REMOVING RESTRICTIONS. An amendment to a certificate of authority or statement of operations that removes the limitation imposed under this section is not effective unless the insurer, on the effective date of the amendment, complies with the capital, surplus and other requirements applicable to the insurer under chs. 600 to 645.