Question 1

Is W42 a billable ICD-10 code?

Accepted Answer

No, W42 is not a billable code. It is a category code that requires additional specificity. You must select a more specific code from the subcategories for billing purposes.

Question 2

What does ICD-10 code W42 mean?

Accepted Answer

ICD-10-CM code W42 represents Exposure to noise. 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 W42 introduced?

Accepted Answer

Code W42 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 W42?

Accepted Answer

The parent category for W42 is section:W20-W49 (Exposure to inanimate mechanical forces (W20-W49)). This hierarchical classification helps organize related diagnoses for more accurate coding.

Question 5

Does W42 require a 7th character extension?

Accepted Answer

Yes, W42 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., W42XXA for initial encounter). The extension indicates whether this is an initial visit, follow-up, or treatment for a late effect.

W422026

Excludes14Not coded together

Notes1Additional information

7th Character Extensions3Encounter type specifiers

Is W42 a billable ICD-10 code?

What does ICD-10 code W42 mean?

When was ICD-10 code W42 introduced?

What is the parent category for ICD-10 code W42?

Does W42 require a 7th character extension?