ICD-10-CM > S00-T88 > T51-T65 > T52 > T52.1 > T52.1X > T52.1X4 T52.1X4 Toxic effect of benzene, undetermined Non-Billable/Non-Specific Codes T52.1X4A..., initial encounterT52.1X4D..., subsequent encounterT52.1X4S..., sequela