DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

X04 Exposure to ignition of highly flammable material

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

X04 is not billable. The category heads 3 billable codes in FY2027. 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. X00-X08 Exposure to smoke, fire and flames (X00-X08)
  3. X04 Exposure to ignition of highly flammable material
Billable codes
3
Subdivisions
0
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in X04

  1. X04.XXXA
    Exposure to ignition of highly flammable material, initial encounter
    Billable
  2. X04.XXXD
    Exposure to ignition of highly flammable material, subsequent encounter
    BillableExempt
  3. X04.XXXS
    Exposure to ignition of highly flammable material, sequela
    BillableExempt

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 X04

Inclusion terms

  • Exposure to ignition of gasoline
  • Exposure to ignition of kerosene
  • Exposure to ignition of petrol

Excludes2

  • exposure to ignition or melting of nightwear (X05) X05
  • exposure to ignition or melting of other clothing and apparel (X06) X06

Notes that also apply

Block X00-X08 instructions (Excludes1 1, Excludes2 3): printed on the block page.

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

7th characters

7th characters for X04 defined here

The appropriate 7th character is to be added to code X04

7th characters for X04
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