ICD-10-CM > S00-T88 > T36-T50 > T38 > T38.5 > T38.5X > T38.5X6 T38.5X6 Underdosing of other estrogens and progestogens Non-Billable/Non-Specific Codes T38.5X6A..., initial encounterT38.5X6D..., subsequent encounterT38.5X6S..., sequela