S91.00 — Unspecified open wound of ankle
Is S91.00 billable?
No — S91.00 is a non-billable header code. S91.00 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 S91.00.
Billable codes under this header
- S91.001AUnspecified open wound, right ankle, initial encounter
- S91.001DUnspecified open wound, right ankle, subsequent encounter
- S91.001SUnspecified open wound, right ankle, sequela
- S91.002AUnspecified open wound, left ankle, initial encounter
- S91.002DUnspecified open wound, left ankle, subsequent encounter
- S91.002SUnspecified open wound, left ankle, sequela
- S91.009AUnspecified open wound, unspecified ankle, initial encounter
- S91.009DUnspecified open wound, unspecified ankle, subsequent encounter
- S91.009SUnspecified open wound, unspecified ankle, sequela
S91.00 at a glance
| Code | S91.00 |
|---|---|
| Description | Unspecified open wound of ankle |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is S91.00 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to S91.00. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Wound, open › ankle
Excludes1 — never code together — inherited from S91
The conditions below can never be reported together with S91.00 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- open fracture of ankle, foot and toes (S92.-with 7th character B)
- traumatic amputation of ankle and foot (S98.-)
Use additional code — inherited from Chapter 19
Report an additional code alongside S91.00 to fully describe the condition. S91.00 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 S91.00, but a patient may have both at the same time. When documentation supports it, S91.00 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S90-S99
The conditions below are not part of S91.00, but a patient may have both at the same time. When documentation supports it, S91.00 and the excluded code may both be reported.
Code also — inherited from S91
Two codes may be needed to describe the condition fully. Whether S91.00 is sequenced first depends on the reason for the encounter.
- any associated wound infection
What codes fall under S91.00? (3)
How long has S91.00 existed?
S91.00 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.