ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.2 > T43.22 > T43.226 T43.226 Underdosing of selective serotonin reuptake inhibitors Non-Billable/Non-Specific Codes T43.226A..., initial encounterT43.226D..., subsequent encounterT43.226S..., sequela