ICD-10-CM > S00-T88 > T36-T50 > T50 > T50.1 > T50.1X > T50.1X6 T50.1X6 Underdosing of loop [high-ceiling] diuretics Non-Billable/Non-Specific Codes T50.1X6A..., initial encounterT50.1X6D..., subsequent encounterT50.1X6S..., sequela