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ICD-10-CM · FY 2026 APRIL UPDATE

T58.9

Toxic effect of carbon monoxide from unspecified source

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
T58.91Toxic effect of carbon monoxide from unspecified source, accidental (unintentional)Category
T58.91XAToxic effect of carbon monoxide from unspecified source, accidental (unintentional), initial encounterBillable
T58.91XDToxic effect of carbon monoxide from unspecified source, accidental (unintentional), subsequent encounterBillable
T58.91XSToxic effect of carbon monoxide from unspecified source, accidental (unintentional), sequelaBillable
T58.92Toxic effect of carbon monoxide from unspecified source, intentional self-harmCategory
T58.92XAToxic effect of carbon monoxide from unspecified source, intentional self-harm, initial encounterBillable
T58.92XDToxic effect of carbon monoxide from unspecified source, intentional self-harm, subsequent encounterBillable
T58.92XSToxic effect of carbon monoxide from unspecified source, intentional self-harm, sequelaBillable
T58.93Toxic effect of carbon monoxide from unspecified source, assaultCategory
T58.93XAToxic effect of carbon monoxide from unspecified source, assault, initial encounterBillable
T58.93XDToxic effect of carbon monoxide from unspecified source, assault, subsequent encounterBillable
T58.93XSToxic effect of carbon monoxide from unspecified source, assault, sequelaBillable
T58.94Toxic effect of carbon monoxide from unspecified source, undeterminedCategory
T58.94XAToxic effect of carbon monoxide from unspecified source, undetermined, initial encounterBillable
T58.94XDToxic effect of carbon monoxide from unspecified source, undetermined, subsequent encounterBillable
T58.94XSToxic effect of carbon monoxide from unspecified source, undetermined, sequelaBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.