Alphabetic Index FY2027

X05.XXXS

Exposure to ignition or melting of nightwear, sequela

FY2027Chapter 20: External causes of morbidity/X00–X08 Exposure to smoke, fire and flames

BillableComplete code, valid to report

X05.XXXS (also written X05XXXS) is a billable ICD-10-CM diagnosis code for exposure to ignition or melting of nightwear, sequela. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 3 codes in category X05 (Exposure to ignition or melting of nightwear). Its 7th character, S, means sequela. Its coding notes include 1 Excludes1 entry and 8 Excludes2 entries.

7th character

Category X05 requires a 7th character. X05 has only 3 characters, so a placeholder X fills the empty positions.

Assembled code X05.XXXS Open code

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

An external cause code is never a principal or first-listed diagnosis. Its 7th character is assigned for each encounter and should match the injury or condition code.

Guidelines I.C.20.a.2; I.C.20.a.6External cause codesRead the official text

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Also from chapter/block level (1 note)
Inherited from X00–X08 Exposure to smoke, fire and flames

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from X05 Exposure to ignition or melting of nightwear
  • exposure to uncontrolled fire in building or structure (X00.-)
  • exposure to uncontrolled fire, not in building or structure (X01.-)
  • exposure to controlled fire in building or structure (X02.-)
  • exposure to controlled fire, not in building or structure (X03.-)
  • exposure to ignition of highly flammable materials (X04.-)
Also from chapter/block level (3 notes)
Inherited from X00–X08 Exposure to smoke, fire and flames
  • explosions (W35-W40)
  • lightning (T75.0-)
  • transport accident (V01-V99)

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 20 External causes of morbidity
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.