The Directions are being made under sections 16BB(4), 17(1) and 126(4) of the National Health Service Act 1977.
Mae'r Cyfarwyddiadau'n cael eu gwneud o dan adrannau 16BB(4), 17(1) a 126(4) o Ddeddf y Gwasanaeth Iechyd Gwladol 1977.