ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.5 > T43.50 > T43.506 T43.506 Underdosing of unspecified antipsychotics and neuroleptics Non-Billable/Non-Specific Codes T43.506A..., initial encounterT43.506D..., subsequent encounterT43.506S..., sequela