Davies was laid out by what appeared to be a punch from behind by Hore just seconds into the All Blacks' 33-10 victory. The Cardiff Blues lock later went to hospital to undergo precautionary checks.
A Six Nations Committee statement said: "Andrew Hore, hooker for New Zealand, has been cited by the IRB's independent Citing Commissioner for allegedly striking an opponent during the match between Wales and New Zealand at the Millennium Stadium on Saturday.
"The relevant incident occurred in the second minute of the match and involved Wales lock forward Bradley Davies.
"The time and date of the hearing, before the IRB's appointed independent judicial officer, have yet to be fixed."