ICD-10-CM > S00-T88 > T36-T50 > T37 > T37.8 > T37.8X > T37.8X6 T37.8X6 Underdosing of other specified systemic anti-infectives and antiparasitics Non-Billable/Non-Specific Codes T37.8X6A..., initial encounterT37.8X6D..., subsequent encounterT37.8X6S..., sequela