ICD-10-CM > S00-T88 > T36-T50 > T42 > T42.5 > T42.5X > T42.5X5 T42.5X5 Adverse effect of mixed antiepileptics Non-Billable/Non-Specific Codes T42.5X5A..., initial encounterT42.5X5D..., subsequent encounterT42.5X5S..., sequela