Hmmm, didn't have as much time to delve as I would have liked, but yes, 995.61 for anaphylaxis to peanut. "Food" in general is 995.60.
Under Anaphylactic shock or reaction, there was also purpura with a code of 287.0.
I didn't see any modifiers for route of ingestion, but like I said, I didn't have much time to delve.
If there's more time tomorrow, I'll check the asthma, urticaria and contact derm.
I don't know what your purpose is wrt to this research, but as I was looking at the books it really hit me how under-diagnosed anaphylaxis probably is.
Maybe that's your point, LOL.
ETA: Interestingly, no code for idiopathic.