I'm reviewing XAJH again, and I really think that Ping Yizhi is probably the best doctor that I've read about, above that of Hu Qingniu and any others. Why?
As of Chapter 17, this was Linghu Chong's situation:
a) He had his own internal energy crushed by the 6 energy streams of the Peach Fairies,
b) Monk Bujie sent two more powerful energy streams into his body which fought with that of the Peach Fairies and used his body as the battleground,
c) He consumed a powerful tonic that was designed for a female, which added fuel to the fire,
d) He lost a large amount of blood,
e) He was filled with the highly poisonous and toxic blood of the Miao girls of the Five Poisons sect; it was stated that if one attempted to neutralize the poisons one by one, they would clash with his seven energy streams and he would die in three hours,
f) He then drank the 'Five-Sylph Mega Nourishing Wine', which caused him even more damage, due to adding even more internal energy into his body.
And despite all that, Ping Yizhi still thought he would be able to cure Linghu Chong, were it not for the fact that Linghu Chong had completely lost the will to live.