X31
X31: Exposure to excessive natural cold
Non-billable headerICD-10-CM
X31 is a non-billable header ICD-10-CM code for exposure to excessive natural cold. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to code X31
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- 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
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Alphabetic index entries that lead here
- Frostbite
- Exposure›cold(accidental) (excessive) (extreme) (natural) (place)
- Forces of nature›cold(natural)
- Immersion›hand or foot due to cold(excessive)
- Overexposure›cold
- Exposure›cold›due to›weather(conditions)
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead X31
3 child codes. Green means billable.