Is ICD-10-CM code X18 billable?

No, X18 (Contact with other hot metals) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code X18 belong to?

X18 belongs to Chapter 20 of the ICD-10-CM tabular list: V00–Y99 (External Causes of Morbidity).

X18Not billable, use a more specific code below

Contact with other hot metals

In Contact with heat and hot substances (X10-X19), chapter 20: External Causes of Morbidity

3 billable codes under X18: none are a CC or MCC; none map to an HCC.

Instructional notes

Includes: conditions that are coded here

Contact with liquid metal

Also applies, from Contact with heat and hot substances (X10-X19)

These notes sit on X10-X19 and apply to every code under it, including X18.

Excludes1: not coded here, use a different code

exposure to excessive natural heat (X30)
exposure to fire and flames (X00-X08)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.

General External Cause Coding Guidelines (page 88)
Place of Occurrence Guideline (page 89)
Activity Code (page 89)
Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
If the Reporting Format Limits the Number of External Cause Codes (page 90)
Multiple External Cause Coding Guidelines (page 90)
Child and Adult Abuse Guideline (page 90)
Unknown or Undetermined Intent Guideline (page 91)

Read Section I.C.20 (page 87), 3 more topics

All codes under X18

X18 can't be used on a claim. Pick a billable code below; grey headings group them.

X18 MS-DRGs

This code does not group to an MS-DRG as a principal diagnosis.

Other codes that refer to X18

Notes on these codes point to X18.

X12 Excludes1: hot (liquid) metals (X18)

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.