Contact with other and unspecified machinery (W31) ICD-10-CM
The W31 code range covers contact with other and unspecified machinery with 38 ICD-10-CM diagnosis codes. 27 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- 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
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category W31
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the W31 Range 38 codes · 27 billable
- W31 Contact with other and unspecified machineryNon-billable
- W31.0 Contact with mining and earth-drilling machineryNon-billable
- W31.0XXA Contact with mining and earth-drilling machinery, initial encounter
- W31.0XXD Contact with mining and earth-drilling machinery, subsequent encounter
- W31.0XXS Contact with mining and earth-drilling machinery, sequela
- W31.1 Contact with metalworking machinesNon-billable
- W31.1XXA Contact with metalworking machines, initial encounter
- W31.1XXD Contact with metalworking machines, subsequent encounter
- W31.1XXS Contact with metalworking machines, sequela
- W31.2 Contact with powered woodworking and forming machinesNon-billable
- W31.2XXA Contact with powered woodworking and forming machines, initial encounter
- W31.2XXD Contact with powered woodworking and forming machines, subsequent encounter
- W31.2XXS Contact with powered woodworking and forming machines, sequela
- W31.3 Contact with prime moversNon-billable
- W31.3XXA Contact with prime movers, initial encounter
- W31.3XXD Contact with prime movers, subsequent encounter
- W31.3XXS Contact with prime movers, sequela
- W31.8 Contact with other specified machineryNon-billable
- W31.81 Contact with recreational machineryNon-billable
- W31.81XA Contact with recreational machinery, initial encounter
- W31.81XD Contact with recreational machinery, subsequent encounter
- W31.81XS Contact with recreational machinery, sequela
- W31.82 Contact with other commercial machineryNon-billable
- W31.82XA Contact with other commercial machinery, initial encounter
- W31.82XD Contact with other commercial machinery, subsequent encounter
- W31.82XS Contact with other commercial machinery, sequela
- W31.83 Contact with special construction vehicle in stationary useNon-billable
- W31.83XA Contact with special construction vehicle in stationary use, initial encounter
- W31.83XD Contact with special construction vehicle in stationary use, subsequent encounter
- W31.83XS Contact with special construction vehicle in stationary use, sequela
- W31.89 Contact with other specified machineryNon-billable
- W31.89XA Contact with other specified machinery, initial encounter
- W31.89XD Contact with other specified machinery, subsequent encounter
- W31.89XS Contact with other specified machinery, sequela
- W31.9 Contact with unspecified machineryNon-billable
- W31.9XXA Contact with unspecified machinery, initial encounter
- W31.9XXD Contact with unspecified machinery, subsequent encounter
- W31.9XXS Contact with unspecified machinery, sequela
About the W31 Code Range
The ICD-10 code W31 and its subcodes classify injuries caused by contact with various types of machinery, including mining, metalworking, woodworking, prime movers, and recreational machines. These codes specify whether the encounter is the initial injury, a subsequent medical visit, or an ongoing sequela (resulting condition).
These codes cover a wide range of incidents such as accidents caused by mining and earth-drilling machinery, metalworking machines like lathes and power presses, powered woodworking machines such as band saws and sanders, and prime movers including gas turbines or steam engines. The section also includes contact with other specified machinery like commercial manufacturing machines, special construction vehicles, and recreational machinery such as roller coasters and fairground rides. For example, W31.0XXA is used for the initial encounter of an accident caused by mining and earth-drilling machinery, while W31.1XXA is designated for accidental injuries involving metalworking machines like abrasive wheels or forging machines.
Additionally, codes like W31.9XXA cover unspecified machinery-related accidents, including incidents like being accidentally caught, crushed, cut, or struck by machinery. These detailed codes help medical coders accurately capture the specific type of machine and encounter stage, which is crucial for precise injury documentation and reporting. Clinicians and coders look for these diagnoses when coding injuries related to machinery contact to ensure clear identification of the cause and nature of injury.
Questions About This Page
How many billable codes are in the W31 range?
Of the 38 codes in this range, 27 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the W31 range classify?
The range classifies contact with other and unspecified machinery. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
