ICD-10-CM > S00-T88 > T51-T65 > T59 > T59.9 > T59.91 T59.91 Toxic effect of unspecified gases, fumes and vapors, accidental (unintentional) Non-Billable/Non-Specific Codes T59.91XA..., initial encounterT59.91XD..., subsequent encounterT59.91XS..., sequela