At the end of June 2019, Cwm Taf Morgannwg advised the Welsh Government that they thought there was an issue with the reporting of certain RTT waiting lists.
Ar 16 Mai, sylwodd y byrddau iechyd ar anghysondeb posibl rhwng y meini prawf cymhwysedd a bennwyd gan JCVI a’r bobl a oedd yn dod i gael eu brechu.