X18 ICD-10-CM Code: Contact with other hot metals
X18 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
HCC Buddy Code Card
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FY 2026 Apr update / External causes of morbidity (V00-Y99) / Contact with heat and hot substances (X10-X19)
X18
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceContact with other hot metals
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Contact with liquid metal
Excludes 2
OfficialNo Excludes 2 notes are included in this display for X18. Check the code and parent instructions in the Code Book.
Related Codes
No related codes are included in this display for X18. Check the Code Book for the complete code path.
Includes
OfficialNo Includes notes are included in this display for X18. Check the code and parent instructions in the Code Book.
Excludes 1
Official- exposure to excessive natural heat (X30)Inherited from X10-X19
- exposure to fire and flames (X00-X08)Inherited from X10-X19
Code First
OfficialNo Code First sequencing instructions are included in this display for X18. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for X18. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for X18. Check the code and parent instructions in the Code Book.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- X18
- Description
- Contact with other hot metals
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
X18 is the ICD-10-CM diagnosis code for contact with other hot metals. X18 sits in the ICD-10-CM chapter for external causes of morbidity (v00-y99), within the section covering contact with heat and hot substances (x10-x19).
Header codes like X18 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for X18 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.