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ICD-10-CM 2027

ICD-10 code for lip s corrosion

T20.42

Corrosion of unspecified degree of lip(s)

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › lip (s)”. Page updated September 29, 2026.

About coding lip s corrosion

The ICD-10-CM code for lip s corrosion is T20.42 (Corrosion of unspecified degree of lip(s)). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T20.42.

Within T20.4 (corrosion of unspecified degree of head, face, and neck), T20.42 is specifically for corrosion of unspecified degree of lip(s). Related codes cover unspecified site (T20.40), ear [any part, except ear drum] (T20.41), chin (T20.43), nose (septum) (T20.44), scalp [any part] (T20.45), forehead and cheek (T20.46), neck (T20.47) and multiple sites of head, face, and neck (T20.49).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

More specific lip s corrosion codes (official index)

  • first degree T20.52 — Corrosion of first degree of lip(s)
  • second degree T20.62 — Corrosion of second degree of lip(s)
  • third degree T20.72 — Corrosion of third degree of lip(s)

Common questions about lip s corrosion ICD-10 codes

What is the ICD-10 code for lip s corrosion?

T20.42 — Corrosion of unspecified degree of lip(s) (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T20.52, T20.62, T20.72.

What is the ICD-10 code for first degree lip s corrosion?

T20.52 — Corrosion of first degree of lip(s) (header code; choose a more specific subcode).

What is the ICD-10 code for second degree lip s corrosion?

T20.62 — Corrosion of second degree of lip(s) (header code; choose a more specific subcode).

What is the ICD-10 code for third degree lip s corrosion?

T20.72 — Corrosion of third degree of lip(s) (header code; choose a more specific subcode).

Is T20.42 billable?

No. T20.42 is a header code. Report one of its more specific subcodes instead.