ICD-10-CM > S00-T88 > T36-T50 > T37 > T37.1 > T37.1X > T37.1X6 T37.1X6 Underdosing of antimycobacterial drugs Non-Billable/Non-Specific Codes T37.1X6A..., initial encounterT37.1X6D..., subsequent encounterT37.1X6S..., sequela