What does ICD-10 code S91 mean?

ICD-10 code S91 is the standardized code used for open wound of ankle, foot and toes in medical records and coding systems.

When is ICD-10 code S91 used?

Doctors, hospitals, and insurers may use ICD-10 code S91 when recording open wound of ankle, foot and toes in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code S91 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code S91: Open wound of ankle, foot and toes

Name: ICD-10 Code S91: Open wound of ankle, foot and toes
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:39:37.689Z

S91 is an ICD-10 diagnosis entry used to group records related to Open wound of ankle, foot and toes. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

When is it used?

May be used when a clinician documents open wound of ankle, foot and toes in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

19Injury, poisoning and certain other consequences of external causes (S00-T88)

block

S90-S99Injuries to the ankle and foot

currentS90-S99

Official coding notes

Excludes1 (do not code together)

open fracture of ankle, foot and toes (S92.-with 7th character B)
traumatic amputation of ankle and foot (S98.-)

Code also

any associated wound infection

7th character notes

The appropriate 7th character is to be added to each code from category S91
initial encounter
subsequent encounter
sequela

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Emergency Medicine SpecialistOrthopedic Specialist

Sibling codes

S90Superficial injury of ankle, foot and toes S92Fracture of foot and toe, except ankle S93Dislocation and sprain of joints and ligaments at ankle, foot and toe level S94Injury of nerves at ankle and foot level S95Injury of blood vessels at ankle and foot level S96Injury of muscle and tendon at ankle and foot level S97Crushing injury of ankle and foot S98Traumatic amputation of ankle and foot S99Other and unspecified injuries of ankle and foot

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

S91

Common synonyms

Open wound of ankle, foot and toes

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.