ICD-10-CM 2027 diagnosis code

S81.0Open wound of knee

Not billable — use a more specific codeRequires 7th character

S81.0 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it and add the required 7th character.

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 S81.0

S81.0 is the ICD-10-CM diagnosis code for open wound 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 6 subcodes must be used instead.

Within S81 (open wound of knee and lower leg), S81.0 is specifically for open wound of knee. Related codes cover lower leg (S81.8).

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.

7th character

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

Ainitial encounter
Dsubsequent encounter
Ssequela

Notes that apply from higher levels

Instructions written at a parent level also apply to S81.0.

› 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.

Code history

2016
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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about S81.0

Is S81.0 billable?: No. S81.0 is a header code. Report one of its more specific subcodes instead.