W31.9Header code — not billable
Contact with unspecified machinery
- Chapter
- 20. External causes of morbidity
- Category
- W31
- Effective date
- October 1, 2026
Related codes in category W31
W31Contact with other and unspecified machineryW31.0Contact with mining and earth-drilling machineryW31.0XXAContact w mining and earth-drilling machinery, init encntrYesW31.0XXDContact w mining and earth-drilling machinery, subs encntrYesW31.0XXSContact with mining and earth-drilling machinery, sequelaYesW31.1Contact with metalworking machinesW31.1XXAContact with metalworking machines, initial encounterYesW31.1XXDContact with metalworking machines, subsequent encounterYesW31.1XXSContact with metalworking machines, sequelaYesW31.2Contact with powered woodworking and forming machinesW31.2XXAContact w powered woodworking and forming machines, initYesW31.2XXDContact w powered woodworking and forming machines, subsYes
Frequently asked questions
What is ICD-10 code W31.9?
W31.9 is an ICD-10-CM diagnosis code for Contact with unspecified machinery.
Is W31.9 a billable code?
No. W31.9 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is W31.9 in?
W31.9 falls under Chapter 20: External causes of morbidity.
When did W31.9 become effective?
W31.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to W31.9?
W31.9 belongs to category W31, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.