The provisions of section 13-64-301 do not apply to any outpatient mental health care facility, including but not limited to a community mental health center or clinic, and to any extended care facility or hospice with sixteen or fewer inpatient beds, including but not limited to nursing homes or rehabilitation facilities. The department of public health and environment shall by rule establish financial responsibility standards which are less than those prescribed in this section for classes of health care institutions which have less risk of exposure to medical malpractice claims or for other reasons that render the limits provided in section 13-64-301 (1)(b) unreasonable or unattainable.