The head of NHS Wales, Judith Paget, has warned the impact on services will be significant, and appointments and procedures will need to be rescheduled as a result.
Mae Judith Paget, Pennaeth GIG Cymru, wedi rhybuddio y bydd hyn yn cael effaith sylweddol ar wasanaethau, a bydd rhaid aildrefnu apwyntiadau a thriniaethau.