ICD-10-CM > S00-T88 > T51-T65 > T59 > T59.0 > T59.0X > T59.0X4 T59.0X4 Toxic effect of nitrogen oxides, undetermined Non-Billable/Non-Specific Codes T59.0X4A..., initial encounterT59.0X4D..., subsequent encounterT59.0X4S..., sequela