ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.4 > T43.4X > T43.4X6 T43.4X6 Underdosing of butyrophenone and thiothixene neuroleptics Non-Billable/Non-Specific Codes T43.4X6A..., initial encounterT43.4X6D..., subsequent encounterT43.4X6S..., sequela