ICD-10-CM > S00-T88 > T36-T50 > T45 > T45.6 > T45.61 > T45.616 T45.616 Underdosing of thrombolytic drugs Non-Billable/Non-Specific Codes T45.616A..., initial encounterT45.616D..., subsequent encounterT45.616S..., sequela