ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.4 > T40.42 T40.42 Poisoning by, adverse effect of and underdosing of tramadol Non-Billable/Non-Specific Codes T40.421Poisoning by tramadol, accidental (unintentional)T40.421A..., initial encounterT40.421D..., subsequent encounterT40.421S..., sequelaT40.422Poisoning by tramadol, intentional self-harmT40.422A..., initial encounterT40.422D..., subsequent encounterT40.422S..., sequelaT40.423Poisoning by tramadol, assaultT40.423A..., initial encounterT40.423D..., subsequent encounterT40.423S..., sequelaT40.424Poisoning by tramadol, undeterminedT40.424A..., initial encounterT40.424D..., subsequent encounterT40.424S..., sequelaT40.425Adverse effect of tramadolT40.425A..., initial encounterT40.425D..., subsequent encounterT40.425S..., sequelaT40.426Underdosing of tramadolT40.426A..., initial encounterT40.426D..., subsequent encounterT40.426S..., sequela