2027 ICD-10-CM Diagnosis Code W31Contact with other and unspecified machinery

ICD-10-CM Codes›V01–Y99›W20-W49›W31

ICD-10-CM W31
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

W31 is a non-billable ICD-10-CM category code for contact with other and unspecified machinery, so it cannot be submitted on claims. Use a more specific code from this category instead, such as W31.0XXA, W31.0XXD, W31.0XXS, and W31.1XXA.

Code Identity

ICD-10-CM Code
W31
Billable Status
No — Non-Billable Category
Code Describes
Contact with other and unspecified machinery
Short Description
Contact with other and unspecified machinery
Same as the full description in the CMS dataset.
Chapter
W20-W49
Exposure to inanimate mechanical forces

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionW20-W49Exposure to inanimate mechanical forces
CategoryW31Contact with other and unspecified machinery
This CodeW31Contact with other and unspecified machinery

Specific Coding for Contact with other and unspecified machineryOverview

Non-specific codes like W31 require more characters. Use one of these billable codes instead:

  • W31.0 for Contact with mining and earth-drilling machinery

  • W31.1 for Contact with metalworking machines

  • W31.2 for Contact with powered woodworking and forming machines

  • W31.3 for Contact with prime movers

  • W31.8 for Contact with other specified machinery

  • W31.81 for Contact with recreational machinery

  • W31.82 for Contact with other commercial machinery

  • W31.83 for Contact with special construction vehicle in stationary use

  • W31.89 for Contact with other specified machinery

  • W31.9 for Contact with unspecified machinery

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to W31: its own notes plus those printed at block W20-W49 and Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On W31 itself
  • contact with agricultural machinery (W30.-)
  • contact with machinery in transport under own power or being towed by a vehicle (V01-V99)
  • exposure to electric current (W86)
From Block W20-W49 Exposure to inanimate mechanical forces applies to 510 codes
  • assault (X92-Y09)
  • contact or collision with animals or persons (W50-W64)
  • exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-)
  • intentional self-harm (X71-X83)

Notes

General instructions on how these codes are used.

From Chapter 20 (V00-Y99) External causes of morbidity and mortality applies to 7,461 codes
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category W31
Values for category W31 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name W31, its category, or a range that includes it.

Excludes1 8

These codes carry an Excludes1 note naming W31: they are not reported together with it, unless the two conditions are unrelated.

  • Block V00-V99 Transport accidents
    agricultural vehicles in stationary use or maintenance (W31.-)
  • V83 Occupant of special vehicle mainly used on industrial premises injured in transport accident
    special industrial vehicle in stationary use or maintenance (W31.-)
  • V85 Occupant of special construction vehicle injured in transport accident
    special construction vehicle in stationary use or maintenance (W31.-)
  • V86 Occupant of special all-terrain or other off-road motor vehicle, injured in transport accident
    special all-terrain vehicle in stationary use or maintenance (W31.-)
  • W09 Fall on and from playground equipment
    fall involving recreational machinery (W31)
  • Block W00-W19 Slipping, tripping, stumbling and falls
    fall (in) (from) machinery (in operation) (W28-W31) names W28-W31, which includes this code
  • W20 Struck by thrown, projected or falling object
    falling object in machinery accident (W24, W28-W31) names W28-W31, which includes this code
  • W23 Caught, crushed, jammed or pinched in or between objects
    injury caused by machinery (W28-W31) names W28-W31, which includes this code

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About W31Overview

What is the ICD-10 code for contact with other and unspecified machinery?

W31 is the ICD-10-CM category for contact with other and unspecified machinery, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is W31 (Contact with other and unspecified machinery) a billable code?

No. This is a category header that groups the codes for contact with other and unspecified machinery, and headers cannot be submitted on claims. Claims for contact with other and unspecified machinery need a more specific code from this category, such as W31.0XXA, W31.0XXD, and W31.0XXS.

Can W31 be reported with a code from W30?

Not as a rule. The Excludes1 note on W31 lists "contact with agricultural machinery (W30.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).