ICD-10-CM > S00-T88 > T36-T50 > T39 > T39.3 > T39.39 > T39.396 T39.396 Underdosing of other nonsteroidal anti-inflammatory drugs [NSAID] Non-Billable/Non-Specific Codes T39.396A..., initial encounterT39.396D..., subsequent encounterT39.396S..., sequela