Well I suppose I should admit I had two of these happen to me only yesterday. Well really one plus one that is really really close. Had a chicken peck me, but that happens a lot considering I keep chickens and they don't really like you taking eggs out from under them. I was also bit by a Horse, not a Cow, but close enough for government work. The horse thing was my fault, got negligent while feeding treats and got my fingers in his mouth.
Of course neither actually required a trip to a Medical provider so no need to actually enter a billing code.