ICD-10-CM > S00-T88 > T36-T50 > T37 > T37.0 > T37.0X > T37.0X6 T37.0X6 Underdosing of sulfonamides Non-Billable/Non-Specific Codes T37.0X6A..., initial encounterT37.0X6D..., subsequent encounterT37.0X6S..., sequela