T20.40 Corrosion of unspecified degree of head, face, and neck, unspecified site

The ICD-10-CM code for Corrosion of unspecified degree of head, face, and neck, unspecified site is T20.40 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

19: Injury, poisoning and certain other consequences of external causes (S00-T88)

Section

T20-T25: Burns and corrosions of external body surface, specified by site (T20-T25)

Category T20

105 codes (88 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to T20.40:

• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › head (and face) (and neck)

Official Coding Guidelines

Current burns T20-T25 classified by depth, extent and agent (X code)

Current burns (T20-T25) are classified by depth, extent and by agent (X code).

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool

Cite This Page

Reference T20.40 with the canonical source and edition:

T20.40 — Corrosion of unspecified degree of head, face, and neck, unspecified site. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/T20.40

Canonical URL: https://icd10codingpro.com/codes/T20.40