2024 ICD-10-CM Diagnosis Code S91.009S

Unspecified open wound, unspecified ankle, sequela

ICD-10-CM Code:
S91.009S
ICD-10 Code for:
Unspecified open wound, unspecified ankle, sequela
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
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)

S91.009S is a billable diagnosis code used to specify a medical diagnosis of unspecified open wound, unspecified ankle, sequela. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

S91.009S is a sequela code, includes a 7th character and should be used for complications that arise as a direct result of a condition like unspecified open wound unspecified ankle. According to ICD-10-CM Guidelines a "sequela" code should be used for chronic or residual conditions that are complications of an initial acute disease, illness or injury. The most common sequela is pain. Usually, two diagnosis codes are needed when reporting sequela. The first code describes the nature of the sequela while the second code describes the sequela or late effect.

Unspecified diagnosis codes like S91.009S 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.

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

Clinical Classification

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

Present on Admission (POA)

S91.009S is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here.

CMS POA Indicator Options and Definitions

POA IndicatorReason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert S91.009S to ICD-9-CM

  • ICD-9-CM Code: 906.1 - Late eff open wnd extrem
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

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.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.