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ICD-10-CM 2027 diagnosis code

S81.05Open bite of knee

Not billable — use a more specific codeRequires 7th character

S81.05 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Looking up by condition? See ICD-10 code for Knee bite.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S81.05

S81.05 is the ICD-10-CM diagnosis code for open bite of knee. It belongs to category S81 (open wound of knee and lower leg), block S80-S89 (injuries to the knee and lower leg) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S81.0 (open wound of knee), S81.05 is specifically for open bite of knee. Related codes cover unspecified open wound of knee (S81.00), laceration without foreign body of knee (S81.01), laceration with foreign body of knee (S81.02), puncture wound without foreign body of knee (S81.03) and puncture wound with foreign body of knee (S81.04).

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 S81.05 together with the conditions in its Excludes1 note: superficial bite of knee (S80.27-).

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

7th character

The appropriate 7th character is to be added to each code from category S81

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Coding notes

Applicable toConditions and synonyms classified to this code
  • Bite of knee NOS
Excludes1Not coded here — never report together with this code

Notes that apply from higher levels

Instructions written at a parent level also apply to S81.05.

› From S81 Open wound of knee and lower leg
Excludes1
  • open fracture of knee and lower leg (S82.-)
  • traumatic amputation of lower leg (S88.-)
Excludes2
  • open wound of ankle and foot (S91.-)
Code also
  • any associated wound infection

Broader instructions also apply from S80-S89 Injuries to the knee and lower leg and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to S81.05.

Codes whose notes reference S81.05

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about S81.05

Is S81.05 billable?

No. S81.05 is a header code. Report one of its more specific subcodes instead.