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X31 ⚠ Non-billable

Exposure to excessive natural cold

ICD-10-CM · FY2026 · External Causes of Morbidity

Code
X31
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
External Causes of Morbidity
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Also known as
  • 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
Excludes1 — never code together
  • cold of man-made origin (W93.-)
  • contact with or inhalation of dry ice (W93.-)
  • contact with or inhalation of liquefied gas (W93.-)
7th character
  • The appropriate 7th character is to be added to code X31

Frequently asked questions

What is ICD-10 code X31?
ICD-10-CM code X31 represents Exposure to excessive natural cold. It is a non-billable header code requiring a more specific subcategory in the External Causes of Morbidity chapter, effective October 1, 2025 – September 30, 2026.
Is X31 billable?
No. X31 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is X31 in?
X31 belongs to the External Causes of Morbidity chapter (V00–Y99) of ICD-10-CM.

Related codes in the X31 category

X31.XXXA Exposure to excessive natural cold, initial encounter Billable X31.XXXD Exposure to excessive natural cold, subsequent encounter Billable X31.XXXS Exposure to excessive natural cold, sequela Billable

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