ICD-10-CM > S00-T88 > T36-T50 > T47 > T47.6 > T47.6X > T47.6X6 T47.6X6 Underdosing of antidiarrheal drugs Non-Billable/Non-Specific Codes T47.6X6A..., initial encounterT47.6X6D..., subsequent encounterT47.6X6S..., sequela