ICD-10-CM 2027
ICD-10 code for breast bite
From the official ICD-10-CM alphabetic index entry “Bite (s) (animal) (human) › breast”. Page updated September 29, 2026.
About coding breast bite
The ICD-10-CM code for breast bite is S21.05 (Open bite of breast). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on S21.05.
Within S21.0 (open wound of breast), S21.05 is specifically for open bite of breast. Related codes cover unspecified open wound of breast (S21.00), laceration without foreign body of breast (S21.01), laceration with foreign body of breast (S21.02), puncture wound without foreign body of breast (S21.03) and puncture wound with foreign body of breast (S21.04).
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.
Don't report S21.05 together with the conditions in its Excludes1 note: superficial bite of breast (S20.17).
More specific breast bite codes (official index)
Don't confuse with (Excludes1 for S21.05)
- superficial bite of breast (S20.17)
Common questions about breast bite ICD-10 codes
What is the ICD-10 code for breast bite?
- S21.05 — Open bite of breast (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: S20.17, S20.16.
What is the ICD-10 code for superficial nec breast bite?
- S20.17 — Other superficial bite of breast (header code; choose a more specific subcode).
Is S21.05 billable?
- No. S21.05 is a header code. Report one of its more specific subcodes instead.