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ICD-10-CM 2027 diagnosis code

W31.1Contact with metalworking machines

Not billable — use a more specific codeRequires 7th character

W31.1 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About W31.1

W31.1 is the ICD-10-CM diagnosis code for contact with metalworking machines. It belongs to category W31 (contact with other and unspecified machinery), block W20-W49 (exposure to inanimate mechanical forces) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within W31 (contact with other and unspecified machinery), W31.1 is specifically for contact with metalworking machines. Related codes cover mining and earth-drilling machinery (W31.0), powered woodworking and forming machines (W31.2), prime movers (W31.3), other specified machinery (W31.8) and unspecified machinery (W31.9).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category W31

Coding notes

Applicable toConditions and synonyms classified to this code
  • Contact with abrasive wheel
  • Contact with forging machine
  • Contact with lathe
  • Contact with mechanical shears
  • Contact with metal drilling machine
  • Contact with milling machine
  • Contact with power press
  • Contact with rolling-mill
  • Contact with metal sawing machine

Notes that apply from higher levels

Instructions written at a parent level also apply to W31.1.

› From W31 Contact with other and unspecified machinery
Excludes1
  • 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)

Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.

Alphabetic index entries

14 entries

Terms in the official ICD-10-CM index that lead to W31.1.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about W31.1

Is W31.1 billable?

No. W31.1 is a header code. Report one of its more specific subcodes instead.