ICD-10-CM > S00-T88 > T36-T50 > T48 > T48.6 > T48.6X > T48.6X6 T48.6X6 Underdosing of antiasthmatics Non-Billable/Non-Specific Codes T48.6X6A..., initial encounterT48.6X6D..., subsequent encounterT48.6X6S..., sequela