ICD-10-CM > S00-T88 > T36-T50 > T36 > T36.8 > T36.8X > T36.8X6 T36.8X6 Underdosing of other systemic antibiotics Non-Billable/Non-Specific Codes T36.8X6A..., initial encounterT36.8X6D..., subsequent encounterT36.8X6S..., sequela