Is X31 a billable code?
No. X31 is a header code that groups 0 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
X31: Exposure to excessive natural cold
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
X31 groups related diagnoses under exposure to excessive natural cold. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
X31 questions
What does X31 mean?
X31 is the ICD-10-CM code for Exposure to excessive natural cold. It is in chapter 21, External causes of morbidity (V00-Y99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.