ICD-10-CM 2027
ICD-10 code for scalp corrosion
From the official ICD-10-CM alphabetic index entry “Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › scalp”. Page updated September 29, 2026.
About coding scalp corrosion
The ICD-10-CM code for scalp corrosion is T20.45 (Corrosion of unspecified degree of scalp [any part]). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T20.45.
Within T20.4 (corrosion of unspecified degree of head, face, and neck), T20.45 is specifically for corrosion of unspecified degree of scalp [any part]. Related codes cover unspecified site (T20.40), ear [any part, except ear drum] (T20.41), lip(s) (T20.42), chin (T20.43), nose (septum) (T20.44), 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 scalp corrosion codes (official index)
Common questions about scalp corrosion ICD-10 codes
What is the ICD-10 code for scalp corrosion?
- T20.45 — Corrosion of unspecified degree of scalp [any part] (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T20.55, T20.65, T20.75.
What is the ICD-10 code for first degree scalp corrosion?
- T20.55 — Corrosion of first degree of scalp [any part] (header code; choose a more specific subcode).
What is the ICD-10 code for second degree scalp corrosion?
- T20.65 — Corrosion of second degree of scalp [any part] (header code; choose a more specific subcode).
What is the ICD-10 code for third degree scalp corrosion?
- T20.75 — Corrosion of third degree of scalp [any part] (header code; choose a more specific subcode).
Is T20.45 billable?
- No. T20.45 is a header code. Report one of its more specific subcodes instead.