ICD-10-CM > S00-T88 > T36-T50 > T36 > T36.A > T36.AX > T36.AX6 T36.AX6 Underdosing of fluoroquinolone antibiotics Non-Billable/Non-Specific Codes T36.AX6A..., initial encounterT36.AX6D..., subsequent encounterT36.AX6S..., sequela