ICD-10-CM > S00-T88 > T36-T50 > T48 > T48.2 > T48.20 > T48.206 T48.206 Underdosing of unspecified drugs acting on muscles Non-Billable/Non-Specific Codes T48.206A..., initial encounterT48.206D..., subsequent encounterT48.206S..., sequela