ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.2 > T43.21 > T43.216 T43.216 Underdosing of selective serotonin and norepinephrine reuptake inhibitors Non-Billable/Non-Specific Codes T43.216A..., initial encounterT43.216D..., subsequent encounterT43.216S..., sequela