Version 2024

2024 ICD-10-CM Diagnosis Code S91

Open wound of ankle, foot and toes

ICD-10-CM Code:
S91
ICD-10 Code for:
Open wound of ankle, foot and toes
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Injuries to the ankle and foot
      (S90-S99)
      • Open wound of ankle, foot and toes
        (S91)

S91 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of open wound of ankle, foot and toes. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Open wound of ankle, foot and toes

Non-specific codes like S91 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for open wound of ankle, foot and toes:

  • S91.0 for Open wound of ankle - NON-BILLABLE CODE

  • S91.00 for Unspecified open wound of ankle - NON-BILLABLE CODE

  • S91.01 for Laceration without foreign body of ankle - NON-BILLABLE CODE

  • S91.02 for Laceration with foreign body of ankle - NON-BILLABLE CODE

  • S91.03 for Puncture wound without foreign body of ankle - NON-BILLABLE CODE

  • S91.04 for Puncture wound with foreign body of ankle - NON-BILLABLE CODE

  • S91.05 for Open bite of ankle - NON-BILLABLE CODE

  • S91.1 for Open wound of toe without damage to nail - NON-BILLABLE CODE

  • S91.10 for Unspecified open wound of toe without damage to nail - NON-BILLABLE CODE

  • S91.11 for Laceration without foreign body of toe without damage to nail - NON-BILLABLE CODE

  • S91.12 for Laceration with foreign body of toe without damage to nail - NON-BILLABLE CODE

  • S91.13 for Puncture wound without foreign body of toe without damage to nail - NON-BILLABLE CODE

  • S91.14 for Puncture wound with foreign body of toe without damage to nail - NON-BILLABLE CODE

  • S91.15 for Open bite of toe without damage to nail - NON-BILLABLE CODE

  • S91.2 for Open wound of toe with damage to nail - NON-BILLABLE CODE

  • S91.20 for Unspecified open wound of toe with damage to nail - NON-BILLABLE CODE

  • S91.21 for Laceration without foreign body of toe with damage to nail - NON-BILLABLE CODE

  • S91.22 for Laceration with foreign body of toe with damage to nail - NON-BILLABLE CODE

  • S91.23 for Puncture wound without foreign body of toe with damage to nail - NON-BILLABLE CODE

  • S91.24 for Puncture wound with foreign body of toe with damage to nail - NON-BILLABLE CODE

  • S91.25 for Open bite of toe with damage to nail - NON-BILLABLE CODE

  • S91.3 for Open wound of foot - NON-BILLABLE CODE

  • S91.30 for Unspecified open wound of foot - NON-BILLABLE CODE

  • S91.31 for Laceration without foreign body of foot - NON-BILLABLE CODE

  • S91.32 for Laceration with foreign body of foot - NON-BILLABLE CODE

  • S91.33 for Puncture wound without foreign body of foot - NON-BILLABLE CODE

  • S91.34 for Puncture wound with foreign body of foot - NON-BILLABLE CODE

  • S91.35 for Open bite of foot - NON-BILLABLE CODE

Coding Guidelines

The appropriate 7th character is to be added to each code from block Open wound of ankle, foot and toes (S91). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Code Also

Code Also
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
  • any associated wound infection

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • open fracture of ankle, foot and toes S92
  • traumatic amputation of ankle and foot S98

7th Character Note

7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
  • The appropriate 7th character is to be added to each code from category S91

7th Character

7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Patient Education


Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

The most common ankle problems are sprains and fractures (broken bones). A sprain is an injury to the ligaments. It may take a few weeks to many months to heal completely. A fracture is a break in a bone. You can also injure other parts of the ankle such as tendons, which join muscles to bone, and cartilage, which cushions your joints. Ankle sprains and fractures are common sports injuries.


[Learn More in MedlinePlus]

Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

  • Bunions - hard, painful bumps on the big toe joint
  • Corns and calluses - thickened skin from friction or pressure
  • Plantar warts - warts on the soles of your feet
  • Fallen arches - also called flat feet

Ill-fitting shoes often cause these problems. Aging and being overweight also increase your chances of having foot problems.


[Learn More in MedlinePlus]

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening. Injuries can happen at work or play, indoors or outdoors, driving a car, or walking across the street.

Wounds are injuries that break the skin or other body tissues. They include cuts, scrapes, scratches, and punctured skin. They often happen because of an accident, but surgery, sutures, and stitches also cause wounds. Minor wounds usually aren't serious, but it is important to clean them. Serious and infected wounds may require first aid followed by a visit to your doctor. You should also seek attention if the wound is deep, you cannot close it yourself, you cannot stop the bleeding or get the dirt out, or it does not heal.

Other common types of injuries include:

  • Animal bites
  • Bruises
  • Burns
  • Dislocations
  • Electrical injuries
  • Fractures (broken bones)
  • Sprains and strains

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.