T58.9 Toxic effect of carbon monoxide from unspecified source

The ICD-10-CM code for Toxic effect of carbon monoxide from unspecified source is T58.9 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

19: Injury, poisoning and certain other consequences of external causes (S00-T88)

Section

T51-T65: Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

Category T58

28 codes (20 billable)

FY2026 Status

Stable since FY2024

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool

Cite This Page

Reference T58.9 with the canonical source and edition:

T58.9 — Toxic effect of carbon monoxide from unspecified source. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/T58.9

Canonical URL: https://icd10codingpro.com/codes/T58.9