ICD-10-CM > S00-T88 > T36-T50 > T36 > T36.9 > T36.96 T36.96 Underdosing of unspecified systemic antibiotic Non-Billable/Non-Specific Codes T36.96XA..., initial encounterT36.96XD..., subsequent encounterT36.96XS..., sequela