ICD-10-CM > S00-T88 > T51-T65 > T54 > T54.0 > T54.0X > T54.0X4 T54.0X4 Toxic effect of phenol and phenol homologues, undetermined Non-Billable/Non-Specific Codes T54.0X4A..., initial encounterT54.0X4D..., subsequent encounterT54.0X4S..., sequela