X00 – Exposure to uncontrolled fire in building or structure

ICD-10-CM 2027 diagnosis code · Exposure to smoke, fire and flames

Non-billable header

ICD-10-CM code X00

Code: X00 (claims format: X00)
Description: Exposure to uncontrolled fire in building or structure
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 20. External causes of morbidity (V00-Y99)
Block: X00-X08 Exposure to smoke, fire and flames

Billable codes under X00

X00 is a header code and cannot be used on claims. Choose the most specific code:

X00.0 – Exposure to flames in uncontrolled fire in building or structureHeader (more codes below)
X00.1 – Exposure to smoke in uncontrolled fire in building or structureHeader (more codes below)
X00.2 – Injury due to collapse of burning building or structure in uncontrolled fireHeader (more codes below)
X00.3 – Fall from burning building or structure in uncontrolled fireHeader (more codes below)
X00.4 – Hit by object from burning building or structure in uncontrolled fireHeader (more codes below)
X00.5 – Jump from burning building or structure in uncontrolled fireHeader (more codes below)
X00.8 – Other exposure to uncontrolled fire in building or structureHeader (more codes below)

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes for X00

Includes:

conflagration in building or structure

Excludes2 (not included here):

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

Code first:

any associated cataclysm

7th character note:

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

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block X00-X08

Excludes1 (not coded here):

arson (X97)

Excludes2 (not included here):

explosions (W35-W40)
lightning (T75.0-)
transport accident (V01-V99)

Frequently asked questions

What is ICD-10 code X00?

X00 is the ICD-10-CM code for exposure to uncontrolled fire in building or structure, in the block X00-X08 (Exposure to smoke, fire and flames).

Is X00 a billable code?

No. X00 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.