W31
Header — not billableContact with other and unspecified machinery
The ICD-10 code for contact with other and unspecified machinery is W31.
W31 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 6 more specific codes below.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
7th character definitions
These definitions specify what each valid 7th-character value means for codes in this category.
- [object Object]
7th character note
This category requires a 7th character to indicate additional clinical detail (e.g. encounter type: initial, subsequent, sequela). The code is incomplete without it.
- The appropriate 7th character is to be added to each code from category W31
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •This category requires a 7th character. Documentation should clearly indicate the episode of care (initial encounter, subsequent encounter, or sequela).
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under W31
Related codes in this category
- W20Struck by thrown, projected or falling objectnon-billable header
- W21Striking against or struck by sports equipmentnon-billable header
- W22Striking against or struck by other objectsnon-billable header
- W23Caught, crushed, jammed or pinched in or between objectsnon-billable header
- W24Contact with lifting and transmission devices, not elsewhere classifiednon-billable header
- W25Contact with sharp glass
- W26Contact with other sharp objectsnon-billable header
- W27Contact with nonpowered hand toolnon-billable header
- W28Contact with powered lawn mower
- W29Contact with other powered hand tools and household machinerynon-billable header
- W30Contact with agricultural machinerynon-billable header
- W32Accidental handgun discharge and malfunctionnon-billable header
- W33Accidental rifle, shotgun and larger firearm discharge and malfunctionnon-billable header
- W34Accidental discharge and malfunction from other and unspecified firearms and gunsnon-billable header
- W35Explosion and rupture of boiler
- W36Explosion and rupture of gas cylindernon-billable header
- W37Explosion and rupture of pressurized tire, pipe or hosenon-billable header
- W38Explosion and rupture of other specified pressurized devices
- W39Discharge of firework
- W40Explosion of other materialsnon-billable header
- W42Exposure to noisenon-billable header
- W44Foreign body entering into or through a natural orificenon-billable header
- W45Foreign body or object entering through skinnon-billable header
- W46Contact with hypodermic needlenon-billable header
- W49Exposure to other inanimate mechanical forcesnon-billable header
- W31Contact with other and unspecified machinerynon-billable header