T48.994 - Poisoning by other agents primarily acting on the respiratory system, undetermined T48.9 - Poisoning by, adverse effect of and underdosing of other and unspecified agents primarily acting on the respiratory system T48.99 - Poisoning by, adverse effect of and underdosing of other agents primarily acting on the respiratory system T48.994 - Poisoning by other agents primarily acting on the respiratory system, undetermined