A member who is in disability retirement status and to whom the provisions of RCW 43.43.040(2) apply shall file with the chief every six months a signed, sworn statement of earnings. In addition, every member in disability retirement status shall file with the chief every six months a signed, sworn statement of his current status of health, any medication or treatment he is undergoing, the nature and description of his employment, if any, and the medical prognosis of his condition.