ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.2 > T43.20 > T43.206 T43.206 Underdosing of unspecified antidepressants Non-Billable/Non-Specific Codes T43.206A..., initial encounterT43.206D..., subsequent encounterT43.206S..., sequela