T59.894A — Toxic effect of other specified gases, fumes and vapors, undetermined, initial encounter
Is T59.894A billable?
Yes, but T59.894A is an unspecified code. T59.894A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T59.894A is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting T59.894A — the more specific alternatives are listed below.
More specific alternatives
- T59.0X1AToxic effect of nitrogen oxides, accidental (unintentional), initial encounter
- T59.1X1AToxic effect of sulfur dioxide, accidental (unintentional), initial encounter
- T59.2X1AToxic effect of formaldehyde, accidental (unintentional), initial encounter
- T59.3X1AToxic effect of lacrimogenic gas, accidental (unintentional), initial encounter
- T59.4X1AToxic effect of chlorine gas, accidental (unintentional), initial encounter
- T59.5X1AToxic effect of fluorine gas and hydrogen fluoride, accidental (unintentional), initial encounter
- T59.6X1AToxic effect of hydrogen sulfide, accidental (unintentional), initial encounter
- T59.7X1AToxic effect of carbon dioxide, accidental (unintentional), initial encounter
T59.894A at a glance
| Code | T59.894A |
|---|---|
| Description | Toxic effect of other specified gases, fumes and vapors, undetermined, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T59.894A?
In T59.894A, the 7th character A means initial encounter. The 7th character is required for T59.894A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T59.894A group to?
T59.894A sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 917Poisoning and Toxic Effects of Drugs with MCCmedical
- 918Poisoning and Toxic Effects of Drugs without MCCmedical
How is T59.894A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T59.89, the nearest indexed parent of T59.894A. Use them to find the family, then select the specific code.
- Inhalation › gases, fumes, or vapors › specified agent NEC
Excludes1 — never code together — inherited from T51-T65
The conditions below can never be reported together with T59.894A 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.-)
Excludes1 — never code together — inherited from T59
The conditions below can never be reported together with T59.894A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- chlorofluorocarbons (T53.5)
Use additional code — inherited from Chapter 19
Report an additional code alongside T59.894A to fully describe the condition. T59.894A 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 T59.894A to fully describe the condition. T59.894A is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T59.894A, but a patient may have both at the same time. When documentation supports it, T59.894A and the excluded code may both be reported.
How long has T59.894A existed?
T59.894A 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.