ICD-10-CM > S00-T88 > T36-T50 > T48 > T48.9 > T48.90 > T48.904 T48.904 Poisoning by unspecified agents primarily acting on the respiratory system, undetermined Non-Billable/Non-Specific Codes T48.904A..., initial encounterT48.904D..., subsequent encounterT48.904S..., sequela