T58.91
⚠ Non-billable (Header)Toxic effect of carbon monoxide from unspecified source, accidental (unintentional)
Injury, poisoning and certain other consequences of external causes (S00-T88)
⚠️ This is a category header code — not billable. Use a more specific child code below.
✅ No additional coding notes for T58.91
Child Codes (3)
T58.91XAToxic effect of carbon monoxide from unspecified source, accidental (unintentional), initial encounterT58.91XDToxic effect of carbon monoxide from unspecified source, accidental (unintentional), subsequent encounterT58.91XSToxic effect of carbon monoxide from unspecified source, accidental (unintentional), sequela
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CodeT58.91
BillableNo — Header code
ParentT58.9
CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)
Excludes10 rule(s)
Excludes20 note(s)
Child codes3
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)