W40 — Explosion of other materials
W40 is a non-billable header ICD-10-CM code for explosion of other materials. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category W40
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Other codes that can never be billed with W40
These codes carry an Excludes1 note pointing at W40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading W40 alone.
- W20Struck by thrown, projected or falling object
- W30Contact with agricultural machinery
- W30.3Contact with grain storage elevator
- W30.3XXAContact with grain storage elevator, initial encounter
- W30.3XXDContact with grain storage elevator, subsequent encounter
- W30.3XXSContact with grain storage elevator, sequela
Risk adjustment
W40 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead W40
4 child codes. Green means billable.
Questions about W40
- Is W40 a billable ICD-10-CM code?
- No. W40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does W40 sit in the tabular list?
- External causes of morbidity (V00-Y99), in the block Exposure to inanimate mechanical forces (W20-W49).
- What cannot be coded together with W40?
- W40 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.