ICD-10-CM > S00-T88 > T51-T65 > T58 > T58.9 T58.9 Toxic effect of carbon monoxide from unspecified source Non-Billable/Non-Specific Codes T58.91Toxic effect of carbon monoxide from unspecified source, accidental (unintentional)T58.91XA..., initial encounterT58.91XD..., subsequent encounterT58.91XS..., sequelaT58.92Toxic effect of carbon monoxide from unspecified source, intentional self-harmT58.92XA..., initial encounterT58.92XD..., subsequent encounterT58.92XS..., sequelaT58.93Toxic effect of carbon monoxide from unspecified source, assaultT58.93XA..., initial encounterT58.93XD..., subsequent encounterT58.93XS..., sequelaT58.94Toxic effect of carbon monoxide from unspecified source, undeterminedT58.94XA..., initial encounterT58.94XD..., subsequent encounterT58.94XS..., sequela