Is ICD-10-CM code T58 billable?

No, T58 (Toxic effect of carbon monoxide) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code T58 belong to?

T58 belongs to Chapter 19 of the ICD-10-CM tabular list: S00–T88 (Injury, Poisoning and Certain Other Consequences of External Causes).

T58Non-billable

Toxic effect of carbon monoxide

Injury, Poisoning and Certain Other Consequences of External Causes·Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)·category·FY 2026

Use a more specific code (0 billable, 5 non-billable)

T58.0Toxic effect of carbon monoxide from motor vehicle exhausthas subcodes T58.1Toxic effect of carbon monoxide from utility gashas subcodes T58.2Toxic effect of carbon monoxide from incomplete combustion of other domestic fuelshas subcodes T58.8Toxic effect of carbon monoxide from other sourcehas subcodes T58.9Toxic effect of carbon monoxide from unspecified sourcehas subcodes

CH19 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Use Additional Code

code to identify any retained foreign body, if applicable (Z18.-)

T51-T65 Parent Instructions

Excludes1(Not coded here. Use a different code.)

contact with and (suspected) exposure to toxic substances (Z77.-)

Use Additional Code

code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
personal history of foreign body fully removed (Z87.821)
to identify any retained foreign body, if applicable (Z18.-)

Instructional Notes

Includes

asphyxiation from carbon monoxide
toxic effect of carbon monoxide from all sources

Clinical Hierarchy

BillableHas subcodes

CH19Injury, poisoning and certain other consequences of external causes (S00-T88)

T51-T65Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

T58Toxic effect of carbon monoxideNot billable

T58.0Toxic effect of carbon monoxide from motor vehicle exhaustSubcodes

T58.1Toxic effect of carbon monoxide from utility gasSubcodes

T58.2Toxic effect of carbon monoxide from incomplete combustion of other domestic fuelsSubcodes

T58.8Toxic effect of carbon monoxide from other sourceSubcodes

T58.9Toxic effect of carbon monoxide from unspecified sourceSubcodes

MS-DRG Classification

2026

No direct MS-DRG triggers identified.