X31 — Exposure to excessive natural cold
Is X31 billable?
No — X31 is a non-billable header code. X31 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 3 billable codes beneath X31.
X31 at a glance
| Code | X31 |
|---|---|
| Description | Exposure to excessive natural cold |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is X31 listed in the External Cause Index?
These are the routes through the External Cause of Injuries Index that lead to X31 — how the injury happened, rather than what the injury was.
- Frostbite
- Exposure › cold (to)
- Forces of nature › cold
- Immersion › hand or foot due to cold (accidental)
- Overexposure › cold (accidental) (to)
- Exposure › cold › due to › weather (to)
Excludes1 — never code together
The conditions below can never be reported together with X31 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Inclusion terms
Alternative wording in documentation that is classified to X31.
- Excessive cold as the cause of chilblains NOS
- Excessive cold as the cause of immersion foot or hand
- Exposure to cold NOS
- Exposure to weather conditions
What codes fall under X31? (3)
How long has X31 existed?
X31 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.