The changes are designed to ensure more people get the life-saving help they need from the ambulance service, while those who do not need an ambulance receive more appropriate care for their needs.
Bydd y newidiadau'n sicrhau bod mwy o bobl yn cael y cymorth angenrheidiol a all achub eu bywyd gan y gwasanaeth ambiwlans, tra bod y rheini nad oes angen ambiwlans arnynt yn cael gofal mwy priodol.