ICD-10-CM > S00-T88 > T36-T50 > T37 > T37.9 > T37.96 T37.96 Underdosing of unspecified systemic anti-infectives and antiparasitics Non-Billable/Non-Specific Codes T37.96XA..., initial encounterT37.96XD..., subsequent encounterT37.96XS..., sequela