ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.6 > T43.60 > T43.606 T43.606 Underdosing of unspecified psychostimulants Non-Billable/Non-Specific Codes T43.606A..., initial encounterT43.606D..., subsequent encounterT43.606S..., sequela