W31Not billable, use a more specific code below
Contact with other and unspecified machinery
In Exposure to inanimate mechanical forces (W20-W49), chapter 20: External Causes of Morbidity
27 billable codes under W31: none are a CC or MCC; none map to an HCC.
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Instructional notes
Also applies, from Exposure to inanimate mechanical forces (W20-W49)
These notes sit on W20-W49 and apply to every code under it, including W31.
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.
- General External Cause Coding Guidelines (page 88)
- Place of Occurrence Guideline (page 89)
- Activity Code (page 89)
- Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
- If the Reporting Format Limits the Number of External Cause Codes (page 90)
- Multiple External Cause Coding Guidelines (page 90)
- Child and Adult Abuse Guideline (page 90)
- Unknown or Undetermined Intent Guideline (page 91)
All codes under W31
W31 can't be used on a claim. Pick a billable code below; grey headings group them.
- W31.0Contact with mining and earth-drilling machinery
- W31.0XXAContact with mining and earth-drilling machinery, initial encounter
- W31.0XXDContact with mining and earth-drilling machinery, subsequent encounter
- W31.0XXSContact with mining and earth-drilling machinery, sequela
- W31.1Contact with metalworking machines
- W31.1XXAContact with metalworking machines, initial encounter
- W31.1XXDContact with metalworking machines, subsequent encounter
- W31.1XXSContact with metalworking machines, sequela
- W31.2Contact with powered woodworking and forming machines
- W31.2XXAContact with powered woodworking and forming machines, initial encounter
- W31.2XXDContact with powered woodworking and forming machines, subsequent encounter
- W31.2XXSContact with powered woodworking and forming machines, sequela
- W31.3Contact with prime movers
- W31.3XXAContact with prime movers, initial encounter
- W31.3XXDContact with prime movers, subsequent encounter
- W31.3XXSContact with prime movers, sequela
- W31.8Contact with other specified machinery
- W31.81Contact with recreational machinery
- W31.81XAContact with recreational machinery, initial encounter
- W31.81XDContact with recreational machinery, subsequent encounter
- W31.81XSContact with recreational machinery, sequela
- W31.82Contact with other commercial machinery
- W31.82XAContact with other commercial machinery, initial encounter
- W31.82XDContact with other commercial machinery, subsequent encounter
- W31.82XSContact with other commercial machinery, sequela
- W31.83Contact with special construction vehicle in stationary use
- W31.83XAContact with special construction vehicle in stationary use, initial encounter
- W31.83XDContact with special construction vehicle in stationary use, subsequent encounter
- W31.83XSContact with special construction vehicle in stationary use, sequela
- W31.89Contact with other specified machinery
- W31.89XAContact with other specified machinery, initial encounter
- W31.89XDContact with other specified machinery, subsequent encounter
- W31.89XSContact with other specified machinery, sequela
- W31.9Contact with unspecified machinery
- W31.9XXAContact with unspecified machinery, initial encounter
- W31.9XXDContact with unspecified machinery, subsequent encounter
- W31.9XXSContact with unspecified machinery, sequela
W31 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
Other codes that refer to W31
Notes on these codes point to W31.
- V00-V99 Excludes1: agricultural vehicles in stationary use or maintenance (W31.-)
- V83 Excludes1: special industrial vehicle in stationary use or maintenance (W31.-)
- V85 Excludes1: special construction vehicle in stationary use or maintenance (W31.-)
- V86 Excludes1: special all-terrain vehicle in stationary use or maintenance (W31.-)
- W00-W19 Excludes1: fall (in) (from) machinery (in operation) (W28-W31)
- W09 Excludes1: fall involving recreational machinery (W31)
- W20 Excludes1: falling object in machinery accident (W24, W28-W31)
- W23 Excludes1: injury caused by machinery (W28-W31)
Code history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.