All medicare supplement policies must be guaranteed renewable and a medicare supplement insurance policy may not provide that the policy may be canceled or nonrenewed by the insurer solely on the grounds of deterioration of health. The issuer shall not cancel or nonrenew the policy for any reason other than nonpayment of premium or material misrepresentation. All medicare supplement policies and certificates must include a renewal or continuation provision. The language or specifications of such provision must be appropriately captioned, appear on the first page of the policy, and shall include any reservation by the issuer or a right to change premium.