Ayoung man is bitten by a dog found to have rabies. although he shows no symptoms of rabies, testing is done to see if he has the infection. the tests come back negative. what diagnosis code is used to establish the medical necessity for the service?

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.