ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.4 > T40.42 > T40.421 T40.421 Poisoning by tramadol, accidental (unintentional) Non-Billable/Non-Specific Codes T40.421A..., initial encounterT40.421D..., subsequent encounterT40.421S..., sequela