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T20.4

Non-billable

Corrosion of unspecified degree of head, face, and neck

T20.4 is the ICD-10-CM code for Corrosion of unspecified degree of head, face, and neck. It is a non-billable category code — use a more specific child code such as T20.40 for billing.

Status
Header (non-billable)
Chapter
S00-T88
Parent
T20
Subcodes
9
Edition
FY2026

S00-T88 Injury, poisoning and certain other consequences of external causes

Code first

  • •(T51-T65) to identify chemical and intent

Use additional code

  • •external cause code to identify place (Y92)

Frequently asked questions

What is ICD-10 code T20.4?
T20.4 is the ICD-10-CM code for "Corrosion of unspecified degree of head, face, and neck". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is T20.4 a billable code?
No — T20.4 is a non-billable header code. Use a more specific child code (such as T20.40) for billing.
What are the subcodes of T20.4?
T20.4 has 9 more specific child codes, including T20.40, T20.41, T20.42.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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