New escalation levels of the other NHS Health Boards, trusts and Special Health Authorities in Wales have also been set out today.
Mae lefelau uwchgyfeirio newydd Byrddau Iechyd eraill y GIG, yr ymddiriedolaethau a’r Awdurdodau Iechyd Arbennig yng Nghymru wedi'u datgan heddiw hefyd.