Is W40.9XXA a billable ICD-10-CM code?

Yes. W40.9XXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does W40.9XXA 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 W40.9XXA?

W40.9XXA carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above W40.9XXA (W40) and apply to it just the same.

W40.9XXA

W40.9XXA — Explosion of unspecified explosive materials, initial encounter

Billable / specific codeICD-10-CMPOA exempt

W40.9XXA is a billable, specific ICD-10-CM code for explosion of unspecified explosive materials, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

The appropriate 7th character is to be added to each code from category W40

A: initial encounter
D: subsequent encounter
S: sequela

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Explosion NOS

Excludes1 inherited from the categories above W40.9XXA

These are not written on W40.9XXA, but they bind it: a note on a category applies to every code beneath it. Billing W40.9XXA with anything listed here is a denial.

Written on W40 — Explosion of other materials

assault by explosive material (X96)
explosion involving legal intervention (Y35.1-)
explosion involving military or war operations (Y36.0-, Y36.2-)
intentional self-harm by explosive material (X75)

Risk adjustment

W40.9XXA 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 history

W40.9XXA has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share W40.9. If W40.9XXA is not quite right, the correct code is usually one of these.

Questions about W40.9XXA

Is W40.9XXA a billable ICD-10-CM code?: Yes. W40.9XXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does W40.9XXA 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 W40.9XXA?: W40.9XXA carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above W40.9XXA (W40) and apply to it just the same.