T58

Header — not billable

Toxic effect of carbon monoxide

The ICD-10 code for toxic effect of carbon monoxide is T58.

T58 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 5 more specific codes below.

Clinical notes

Includes

Terms listed here further define or give examples of the conditions grouped under this code — they describe what the code covers, not a separate diagnosis.

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

7th character definitions

These definitions specify what each valid 7th-character value means for codes in this category.

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7th character note

This category requires a 7th character to indicate additional clinical detail (e.g. encounter type: initial, subsequent, sequela). The code is incomplete without it.

The appropriate 7th character is to be added to each code from category T58

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
•This category requires a 7th character. Documentation should clearly indicate the episode of care (initial encounter, subsequent encounter, or sequela).
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

T58

Clinical notes

Includes

7th character definitions

7th character note

Documentation support

Child codes under T58

Related codes in this category