ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.8 > T43.8X > T43.8X6 T43.8X6 Underdosing of other psychotropic drugs Non-Billable/Non-Specific Codes T43.8X6A..., initial encounterT43.8X6D..., subsequent encounterT43.8X6S..., sequela