2024 ICD-10-CM Diagnosis Code S91.009

Unspecified open wound, unspecified ankle

ICD-10-CM Code:
S91.009
ICD-10 Code for:
Unspecified open wound, unspecified ankle
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)

S91.009 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of unspecified open wound, unspecified ankle. 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.

Unspecified diagnosis codes like S91.009 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to Unspecified open wound, unspecified ankle

Non-specific codes like S91.009 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 unspecified open wound, unspecified ankle:

  • Use S91.009A for initial encounter - BILLABLE CODE

  • Use S91.009D for subsequent encounter - BILLABLE CODE

  • Use S91.009S for sequela - BILLABLE CODE

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Fracture dislocation of ankle joint
  • Fracture dislocation of ankle joint
  • Fracture subluxation of ankle joint
  • Glass in ankle
  • Multiple open wounds of ankle
  • Open dislocation of ankle
  • Open dislocation of ankle
  • Open dislocation of ankle
  • Open dislocation of ankle
  • Open dislocation of distal end of tibia
  • Open dislocation of navicular bone of foot
  • Open dislocation of talus
  • Open division ankle ligament
  • Open division ankle, lateral ligament
  • Open division ankle, medial ligament
  • Open division calcaneofibular ligament
  • Open division distal tibiofibular ligament
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open fracture dislocation of ankle joint
  • Open fracture dislocation of ankle joint
  • Open fracture of ankle
  • Open fracture of talus
  • Open fracture of talus
  • Open fracture of talus
  • Open fracture of talus
  • Open fracture subluxation of ankle joint
  • Open fracture talus, body
  • Open fracture talus, head
  • Open fracture talus, neck
  • Open traumatic subluxation ankle joint
  • Open traumatic subluxation ankle joint
  • Open wound of ankle
  • Open wound of ankle with complication
  • Open wound of ankle without complication
  • Open wound of lower limb without complication
  • Subluxation of ankle joint
  • Subluxation of ankle joint

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

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]

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.