This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
The doctor told me that it's difficult to recover completely and I'd probably have some permanent damage left over.
Although I was observing the traffic rules strictly, I was hit by a truck and got a bad injury that would take a year to heal completely.
When Viet suffered severe cuts from a gang war that would have normally taken six months to heal completely, Koichi healed him with his special healing powers.