ICD-10-CM > S00-T88 > T36-T50 > T47 > T47.1 > T47.1X > T47.1X6 T47.1X6 Underdosing of other antacids and anti-gastric-secretion drugs Non-Billable/Non-Specific Codes T47.1X6A..., initial encounterT47.1X6D..., subsequent encounterT47.1X6S..., sequela