Toxic effect of carbon monoxide from unspecified source, undetermined, initial encounter
Billable / specific
T58.94XA is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Inclusion terms
Includes (from T58)
- asphyxiation from carbon monoxide
- toxic effect of carbon monoxide from all sources
- Note: Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- Note: The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
- Note: When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.
Excludes1
Not coded here — never report together with this code.
Excludes2
Not included here — may be reported together when both conditions exist.
Use additional code
Add a code to identify the following, if applicable.
- code to identify any retained foreign body, if applicable (Z18.-) (from T58)
- code(s): (from T58)
- for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) (from T58)
- personal history of foreign body fully removed (Z87.821) (from T58)
- to identify any retained foreign body, if applicable (Z18.-) (from T58)
7th character
The 7th character values that apply to this code (defined at T58). Use the placeholder "X" for missing positions.
| Character | Meaning |
|---|---|
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
Parent code
- T58.94Toxic effect of carbon monoxide from unspecified source, undeterminedNeeds 7th char