DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

W40 Explosion of other materials

  • Header · not billable
  • Codes take a 7th character

W40 is not billable. The category heads 12 billable codes in FY2027, grouped under 4 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Where it sits

  1. Chapter 20 External causes of morbidity (V00-Y99)
  2. W20-W49 Exposure to inanimate mechanical forces (W20-W49)
  3. W40 Explosion of other materials
Billable codes
12
Subdivisions
4
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in W40

  1. W40.0
    Explosion of blasting material +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 4

    Inclusion terms

    • Explosion of blasting cap
    • Explosion of detonator
    • Explosion of dynamite
    • Explosion of explosive (any) used in blasting operations
  2. W40.1
    Explosion of explosive gases +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 9

    Inclusion terms

    • Explosion of acetylene
    • Explosion of butane
    • Explosion of coal gas
    • Explosion in mine NOS
    • Explosion of explosive gas
    • Explosion of fire damp
    • Explosion of gasoline fumes
    • Explosion of methane
    • Explosion of propane
  3. W40.8
    Explosion of other specified explosive materials +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 4, Excludes1 2

    Inclusion terms

    • Explosion in dump NOS
    • Explosion in factory NOS
    • Explosion in grain store
    • Explosion in munitions

    Excludes1

    • explosion involving legal intervention (Y35.1-) Y35.1
    • explosion involving military or war operations (Y36.0-, Y36.2-) Y36.0 Y36.2
  4. W40.9
    Explosion of unspecified explosive materials +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Explosion NOS

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At W40

Excludes1

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

Notes that also apply

Block W20-W49 instructions (Excludes1 4): printed on the block page.

Chapter 20 instructions (Notes 1): printed on the chapter 20 page.

7th characters

7th characters for W40 defined here

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

7th characters for W40
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Hierarchy