numerical code for i hate you

There isn't a universally accepted numerical code for "I hate you," as it is a subjective expression of dislike or anger towards someone. However, if you are referring to a code like a substitution cipher, you could assign numbers to each letter of the phrase. For example:

I = 9
H = 8
A = 1
T = 20
E = 5
Y = 25
O = 15
U = 21

Using this substitution code, "I hate you" would be represented as "9 8 1 20 5 25 15 21".