U.S. ICD-10-CM · FY 2027

X31 ICD-10-CM Code: Exposure to excessive natural cold

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

X31

Exposure to excessive natural cold

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where X31 sits

  1. 1

    Chapter 20

    External causes of morbidity (V00-Y99)

  2. 2

    Section

    Accidents (V00-X58)

  3. 3

    Category X31

    Exposure to excessive natural cold

  4. 4

    Code X31

    Exposure to excessive natural cold

More specific choices

Codes under X31

X31 is a non-billable category. Choose the child code that best matches the documented diagnosis.

X31.XXXA

Exposure to excessive natural cold, initial encounter

X31.XXXD

Exposure to excessive natural cold, subsequent encounter

X31.XXXS

Exposure to excessive natural cold, sequela

Documentation details

Notes for this code

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

Code first

No “code first” instruction is listed for X31.

Use additional code

No “use additional code” instruction is listed for X31.

Excludes1

Conditions that should not be reported together with this code.

  • cold of man-made origin (W93.-)
  • contact with or inhalation of dry ice (W93.-)
  • contact with or inhalation of liquefied gas (W93.-)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for X31.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code X31 mean?

X31 is the FY 2027 U.S. ICD-10-CM code for “Exposure to excessive natural cold.”

Is X31 a billable or specific ICD-10-CM code?

No. X31 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is X31 located in ICD-10-CM?

X31 is listed in Chapter 20, External causes of morbidity (V00-Y99), within Accidents (V00-X58) (V00–X58), under category X31, Exposure to excessive natural cold.

What coding notes are listed for X31?

Its listed inclusion terms are 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. No code-first instruction is listed. Excludes1 notes: cold of man-made origin (W93.-); contact with or inhalation of dry ice (W93.-); contact with or inhalation of liquefied gas (W93.-). No Excludes2 note is listed.

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