ICD-10-CM > S00-T88 > T36-T50 > T44 > T44.1 > T44.1X > T44.1X6 T44.1X6 Underdosing of other parasympathomimetics [cholinergics] Non-Billable/Non-Specific Codes T44.1X6A..., initial encounterT44.1X6D..., subsequent encounterT44.1X6S..., sequela