X31 Exposure to excessive natural cold
The ICD-10-CM code for Exposure to excessive natural cold is X31 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- X30-X39: Exposure to forces of nature (X30-X39)
- Category X31
- 1 code (1 billable)
- FY2026 Status
- Stable since FY2024
Inclusion Terms
- 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
Official Coding Guidelines
Other external cause issues—when not direct hurricane resultc. Other External Causes of Morbidity Code Issues For injuries that are not a direct result of the hurricane, such as an evacuee that has incurred an injury as a result of a motor vehicle accident, assign the appropriate external cause of morbidity code(s) to describe the cause of the injury, but do not assign code X37.0-, Hurricane. If it is not clear whether the injury was a direct result of the hurricane, assume the injury is due to the hurricane and assign code X37.0-, Hurricane, as well as any other applicable external cause of morbidity codes. In addition to code X37.0-, Hurricane, other possible applicable external cause of morbidity codes include: X30-, Exposure to excessive natural heat X31-, Exposure to excessive natural cold X38-, Flood
Used with any code in range A00.0-T88.9, Z00-Z991) Used with any code in the range of A00.0-T88.9, Z00-Z99 An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. Though they are most applicable to injuries, they are also valid for use with such things as infections or diseases due to an external source, and other health conditions, such as a heart attack that occurs during strenuous physical activity.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026