ICD-10-CM > S00-T88 > T36-T50 > T45 > T45.5 > T45.52 > T45.521 T45.521 Poisoning by antithrombotic drugs, accidental (unintentional) Non-Billable/Non-Specific Applicable To Poisoning by antithrombotic drug NOS Codes T45.521A..., initial encounterT45.521D..., subsequent encounterT45.521S..., sequela