Is ICD-10-CM code X31 billable?

Yes, X31 (Exposure to excessive natural cold) is a billable ICD-10-CM diagnosis code, valid for reimbursement on HIPAA-covered transactions for FY2026.

What chapter does ICD-10-CM code X31 belong to?

X31 belongs to Chapter 20 of the ICD-10-CM tabular list: V00–Y99 (External Causes of Morbidity).

X31

Billable

ChapterV00–Y99

Rankcategory

Description

Exposure to excessive natural cold

About ICD-10-CM code X31

X31 is the ICD-10-CM diagnosis code for Exposure to excessive natural cold. It sits in V00-Y99 External Causes of Morbidity, within Exposure to forces of nature (X30-X39). As a billable code, X31 can be reported for reimbursement.

Metadata & Insights

•Billable/specific code (valid for reimbursement).
•Chapter 20: External Causes of Morbidity (V00-Y99).

Instructional Notes

Includes

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(Not coded here. Use a different code.)

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

Clinical Hierarchy

BillableHas subcodes

CH20External causes of morbidity (V00-Y99)

X30-X39Exposure to forces of nature (X30-X39)

X31Exposure to excessive natural coldBillable

X31.XXXAExposure to excessive natural cold, initial encounterBillable

X31.XXXDExposure to excessive natural cold, subsequent encounterBillable

X31.XXXSExposure to excessive natural cold, sequelaBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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