MONA (Missouri Nurses Association). Home > MONA (Missouri Nurses Association). You need to login to view this content. Please Login. Not a Member? The Mission of the Association of Missouri Nurse Practitioners is to advance, support, and promote high standards of care delivered by Advanced Practice Registered Nurses, to promote excellence in practice, education and research, and to serve as a resource for Advanced Practice Registered Nurses in Missouri and. Established in , MHCA is the largest long term care trade association in with a diverse membership of skilled nursing facilities, intermediate care facilities.