Version 2024

2024 ICD-10-CM Diagnosis Code S99.8

Other specified injuries of ankle and foot

ICD-10-CM Code:
S99.8
ICD-10 Code for:
Other specified injuries of ankle and foot
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)
      • Other and unspecified injuries of ankle and foot
        (S99)

S99.8 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of other specified injuries of ankle and foot. 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 Other specified injuries of ankle and foot

Non-specific codes like S99.8 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 other specified injuries of ankle and foot:

  • S99.81 for Other specified injuries of ankle - NON-BILLABLE CODE

  • S99.811 for Other specified injuries of right ankle - NON-BILLABLE CODE

  • Use S99.811A for initial encounter - BILLABLE CODE

  • Use S99.811D for subsequent encounter - BILLABLE CODE

  • Use S99.811S for sequela - BILLABLE CODE

  • S99.812 for Other specified injuries of left ankle - NON-BILLABLE CODE

  • Use S99.812A for initial encounter - BILLABLE CODE

  • Use S99.812D for subsequent encounter - BILLABLE CODE

  • Use S99.812S for sequela - BILLABLE CODE

  • S99.819 for Other specified injuries of unspecified ankle - NON-BILLABLE CODE

  • Use S99.819A for initial encounter - BILLABLE CODE

  • Use S99.819D for subsequent encounter - BILLABLE CODE

  • Use S99.819S for sequela - BILLABLE CODE

  • S99.82 for Other specified injuries of foot - NON-BILLABLE CODE

  • S99.821 for Other specified injuries of right foot - NON-BILLABLE CODE

  • Use S99.821A for initial encounter - BILLABLE CODE

  • Use S99.821D for subsequent encounter - BILLABLE CODE

  • Use S99.821S for sequela - BILLABLE CODE

  • S99.822 for Other specified injuries of left foot - NON-BILLABLE CODE

  • Use S99.822A for initial encounter - BILLABLE CODE

  • Use S99.822D for subsequent encounter - BILLABLE CODE

  • Use S99.822S for sequela - BILLABLE CODE

  • S99.829 for Other specified injuries of unspecified foot - NON-BILLABLE CODE

  • Use S99.829A for initial encounter - BILLABLE CODE

  • Use S99.829D for subsequent encounter - BILLABLE CODE

  • Use S99.829S for sequela - BILLABLE CODE

Coding Guidelines

The appropriate 7th character is to be added to each code from block Other and unspecified injuries of ankle and foot (S99). 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.


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 subcategory S99.8

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]

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.