Yn ôl byrddau iechyd Cymru, gallai tua 20-30% o gleifion sy'n mynd i Adrannau Achosion Brys gael eu trin yn well rywle arall neu mewn ffordd wahanol.
Welsh health boards are reporting that around 20 to 30% of patients who present at Emergency Departments could be better treated elsewhere or in a different way.