ICD-10-CM > S00-T88 > T36-T50 > T39 > T39.2 > T39.2X > T39.2X6 T39.2X6 Underdosing of pyrazolone derivatives Non-Billable/Non-Specific Codes T39.2X6A..., initial encounterT39.2X6D..., subsequent encounterT39.2X6S..., sequela