S81.00 — Unspecified open wound of knee
Is S81.00 billable?
No — S81.00 is a non-billable header code. S81.00 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 9 billable codes beneath S81.00.
Billable codes under this header
- S81.001AUnspecified open wound, right knee, initial encounter
- S81.001DUnspecified open wound, right knee, subsequent encounter
- S81.001SUnspecified open wound, right knee, sequela
- S81.002AUnspecified open wound, left knee, initial encounter
- S81.002DUnspecified open wound, left knee, subsequent encounter
- S81.002SUnspecified open wound, left knee, sequela
- S81.009AUnspecified open wound, unspecified knee, initial encounter
- S81.009DUnspecified open wound, unspecified knee, subsequent encounter
- S81.009SUnspecified open wound, unspecified knee, sequela
S81.00 at a glance
| Code | S81.00 |
|---|---|
| Description | Unspecified open wound of knee |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is S81.00 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to S81.00. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Wound, open › knee
Excludes1 — never code together — inherited from S81
The conditions below can never be reported together with S81.00 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 19
Report an additional code alongside S81.00 to fully describe the condition. S81.00 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of S81.00, but a patient may have both at the same time. When documentation supports it, S81.00 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S80-S89
The conditions below are not part of S81.00, but a patient may have both at the same time. When documentation supports it, S81.00 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S81
The conditions below are not part of S81.00, but a patient may have both at the same time. When documentation supports it, S81.00 and the excluded code may both be reported.
- open wound of ankle and foot (S91.-)
Code also — inherited from S81
Two codes may be needed to describe the condition fully. Whether S81.00 is sequenced first depends on the reason for the encounter.
- any associated wound infection
What codes fall under S81.00? (3)
How long has S81.00 existed?
S81.00 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.