DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

X00 Exposure to uncontrolled fire in building or structure

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

X00 is not billable. The category heads 21 billable codes in FY2027, grouped under 7 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. X00-X08 Exposure to smoke, fire and flames (X00-X08)
  3. X00 Exposure to uncontrolled fire in building or structure
Billable codes
21
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in X00

  1. X00.0
    Exposure to flames in uncontrolled fire in building or structure +7th: A D S
    Needs 7th character
  2. X00.1
    Exposure to smoke in uncontrolled fire in building or structure +7th: A D S
    Needs 7th character
  3. X00.2
    Injury due to collapse of burning building or structure in uncontrolled fire +7th: A D S
    Needs 7th character
    Excludes1 1

    Excludes1

    • injury due to collapse of building not on fire (W20.1) W20.1
  4. X00.3
    Fall from burning building or structure in uncontrolled fire +7th: A D S
    Needs 7th character
  5. X00.4
    Hit by object from burning building or structure in uncontrolled fire +7th: A D S
    Needs 7th character
  6. X00.5
    Jump from burning building or structure in uncontrolled fire +7th: A D S
    Needs 7th character
  7. X00.8
    Other exposure to uncontrolled fire in building or structure +7th: A D S
    Needs 7th character

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 X00

Includes

  • conflagration in building or structure

Excludes2

  • Exposure to ignition or melting of nightwear (X05) X05
  • Exposure to ignition or melting of other clothing and apparel (X06.-) X06
  • Exposure to other specified smoke, fire and flames (X08.-) X08

Code first

  • any associated cataclysm

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 X00 defined here

The appropriate 7th character is to be added to each code from category X00

7th characters for X00
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