T48.906 - Underdosing of unspecified agents primarily acting on the respiratory system T48.9 - Poisoning by, adverse effect of and underdosing of other and unspecified agents primarily acting on the respiratory system T48.90 - Poisoning by, adverse effect of and underdosing of unspecified agents primarily acting on the respiratory system T48.906 - Underdosing of unspecified agents primarily acting on the respiratory system