Question 1

Is X31 a billable ICD-10 code?

Accepted Answer

Yes, X31 is a valid billable ICD-10-CM code for exposure to excessive natural cold. It can be used for medical billing and reimbursement purposes.

Question 2

What does ICD-10 code X31 mean?

Accepted Answer

ICD-10-CM code X31 represents Exposure to excessive natural cold. This code is part of the International Classification of Diseases, 10th Revision, Clinical Modification used for medical coding and billing in the United States.

Question 3

When was ICD-10 code X31 introduced?

Accepted Answer

Code X31 has been part of ICD-10-CM since 2016, when the coding system was mandated for use in the United States. This code was included in the original US implementation.

Question 4

What is the parent category for ICD-10 code X31?

Accepted Answer

The parent category for X31 is section:X30-X39 (Exposure to forces of nature (X30-X39)). This hierarchical classification helps organize related diagnoses for more accurate coding.

Question 5

What conditions are excluded from X31?

Accepted Answer

Code X31 has Type 1 Excludes (mutually exclusive conditions) including: cold of man-made origin (W93.-); contact with or inhalation of dry ice (W93.-); contact with or inhalation of liquefied gas (W93.-). These conditions cannot be coded together with X31 as they represent different diagnoses.

Question 6

Does X31 require a 7th character extension?

Accepted Answer

Yes, X31 requires a 7th character to specify the encounter type. Available extensions include: A (initial encounter), D (subsequent encounter), S (sequela). Use "X" as a placeholder to fill empty positions before the 7th character (e.g., X31XXA for initial encounter). The extension indicates whether this is an initial visit, follow-up, or treatment for a late effect.

X31.XXXS2026

Excludes13Not coded together

Notes5Additional information

Also Known As4Alternative terms

7th Character Extensions3Encounter type specifiers

Related Clinical Codes2Manifestation & etiology relationships