T58.9 — Toxic effect of carbon monoxide from unspecified source
Is T58.9 billable?
No — T58.9 is a non-billable header code. T58.9 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 12 billable codes beneath T58.9.
Billable codes under this header
- T58.91XAToxic effect of carbon monoxide from unspecified source, accidental (unintentional), initial encounter
- T58.91XDToxic effect of carbon monoxide from unspecified source, accidental (unintentional), subsequent encounter
- T58.91XSToxic effect of carbon monoxide from unspecified source, accidental (unintentional), sequela
- T58.92XAToxic effect of carbon monoxide from unspecified source, intentional self-harm, initial encounter
- T58.92XDToxic effect of carbon monoxide from unspecified source, intentional self-harm, subsequent encounter
- T58.92XSToxic effect of carbon monoxide from unspecified source, intentional self-harm, sequela
- T58.93XAToxic effect of carbon monoxide from unspecified source, assault, initial encounter
- T58.93XDToxic effect of carbon monoxide from unspecified source, assault, subsequent encounter
- T58.93XSToxic effect of carbon monoxide from unspecified source, assault, sequela
- T58.94XAToxic effect of carbon monoxide from unspecified source, undetermined, initial encounter
- T58.94XDToxic effect of carbon monoxide from unspecified source, undetermined, subsequent encounter
- T58.94XSToxic effect of carbon monoxide from unspecified source, undetermined, sequela
T58.9 at a glance
| Code | T58.9 |
|---|---|
| Description | Toxic effect of carbon monoxide from unspecified source |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from T51-T65
The conditions below can never be reported together with T58.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- contact with and (suspected) exposure to toxic substances (Z77.-)
Use additional code — inherited from Chapter 19
Report an additional code alongside T58.9 to fully describe the condition. T58.9 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T51-T65
Report an additional code alongside T58.9 to fully describe the condition. T58.9 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T58.9, but a patient may have both at the same time. When documentation supports it, T58.9 and the excluded code may both be reported.
What codes fall under T58.9? (4)
- T58.91Toxic effect of carbon monoxide from unspecified source, accidental (unintentional)not billable
- T58.92Toxic effect of carbon monoxide from unspecified source, intentional self-harmnot billable
- T58.93Toxic effect of carbon monoxide from unspecified source, assaultnot billable
- T58.94Toxic effect of carbon monoxide from unspecified source, undeterminednot billable
How long has T58.9 existed?
T58.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the T58 family? (4)
- T58.0Toxic effect of carbon monoxide from motor vehicle exhaustnot billable
- T58.1Toxic effect of carbon monoxide from utility gasnot billable
- T58.2Toxic effect of carbon monoxide from incomplete combustion of other domestic fuelsnot billable
- T58.8Toxic effect of carbon monoxide from other sourcenot billable