ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.5 > T40.5X > T40.5X6 T40.5X6 Underdosing of cocaine Non-Billable/Non-Specific Codes T40.5X6A..., initial encounterT40.5X6D..., subsequent encounterT40.5X6S..., sequela