2021 ICD-10-CM Code S84

Injury of nerves at lower leg level

Version 2021
Non-Billable Code

Not Valid for Submission

S84 is a "header" nonspecific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of injury of nerves at lower leg level. The code is NOT valid for the year 2021 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.

ICD-10:S84
Short Description:Injury of nerves at lower leg level
Long Description:Injury of nerves at lower leg level

Code Classification

Specific Coding for Injury of nerves at lower leg level

Header codes like S84 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for injury of nerves at lower leg level:

  • S84.0 - Injury of tibial nerve at lower leg level
  • S84.00 - Injury of tibial nerve at lower leg level, unspecified leg
  • S84.00XA - Injury of tibial nerve at lower leg level, unspecified leg, initial encounter
  • S84.00XD - Injury of tibial nerve at lower leg level, unspecified leg, subsequent encounter
  • S84.00XS - Injury of tibial nerve at lower leg level, unspecified leg, sequela
  • S84.01 - Injury of tibial nerve at lower leg level, right leg
  • S84.01XA - Injury of tibial nerve at lower leg level, right leg, initial encounter
  • S84.01XD - Injury of tibial nerve at lower leg level, right leg, subsequent encounter
  • S84.01XS - Injury of tibial nerve at lower leg level, right leg, sequela
  • S84.02 - Injury of tibial nerve at lower leg level, left leg
  • S84.02XA - Injury of tibial nerve at lower leg level, left leg, initial encounter
  • S84.02XD - Injury of tibial nerve at lower leg level, left leg, subsequent encounter
  • S84.02XS - Injury of tibial nerve at lower leg level, left leg, sequela
  • S84.1 - Injury of peroneal nerve at lower leg level
  • S84.10 - Injury of peroneal nerve at lower leg level, unspecified leg
  • S84.10XA - Injury of peroneal nerve at lower leg level, unspecified leg, initial encounter
  • S84.10XD - Injury of peroneal nerve at lower leg level, unspecified leg, subsequent encounter
  • S84.10XS - Injury of peroneal nerve at lower leg level, unspecified leg, sequela
  • S84.11 - Injury of peroneal nerve at lower leg level, right leg
  • S84.11XA - Injury of peroneal nerve at lower leg level, right leg, initial encounter
  • S84.11XD - Injury of peroneal nerve at lower leg level, right leg, subsequent encounter
  • S84.11XS - Injury of peroneal nerve at lower leg level, right leg, sequela
  • S84.12 - Injury of peroneal nerve at lower leg level, left leg
  • S84.12XA - Injury of peroneal nerve at lower leg level, left leg, initial encounter
  • S84.12XD - Injury of peroneal nerve at lower leg level, left leg, subsequent encounter
  • S84.12XS - Injury of peroneal nerve at lower leg level, left leg, sequela
  • S84.2 - Injury of cutaneous sensory nerve at lower leg level
  • S84.20 - Injury of cutaneous sensory nerve at lower leg level, unspecified leg
  • S84.20XA - Injury of cutaneous sensory nerve at lower leg level, unspecified leg, initial encounter
  • S84.20XD - Injury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounter
  • S84.20XS - Injury of cutaneous sensory nerve at lower leg level, unspecified leg, sequela
  • S84.21 - Injury of cutaneous sensory nerve at lower leg level, right leg
  • S84.21XA - Injury of cutaneous sensory nerve at lower leg level, right leg, initial encounter
  • S84.21XD - Injury of cutaneous sensory nerve at lower leg level, right leg, subsequent encounter
  • S84.21XS - Injury of cutaneous sensory nerve at lower leg level, right leg, sequela
  • S84.22 - Injury of cutaneous sensory nerve at lower leg level, left leg
  • S84.22XA - Injury of cutaneous sensory nerve at lower leg level, left leg, initial encounter
  • S84.22XD - Injury of cutaneous sensory nerve at lower leg level, left leg, subsequent encounter
  • S84.22XS - Injury of cutaneous sensory nerve at lower leg level, left leg, sequela
  • S84.8 - Injury of other nerves at lower leg level
  • S84.80 - Injury of other nerves at lower leg level
  • S84.801 - Injury of other nerves at lower leg level, right leg
  • S84.801A - Injury of other nerves at lower leg level, right leg, initial encounter
  • S84.801D - Injury of other nerves at lower leg level, right leg, subsequent encounter
  • S84.801S - Injury of other nerves at lower leg level, right leg, sequela
  • S84.802 - Injury of other nerves at lower leg level, left leg
  • S84.802A - Injury of other nerves at lower leg level, left leg, initial encounter
  • S84.802D - Injury of other nerves at lower leg level, left leg, subsequent encounter
  • S84.802S - Injury of other nerves at lower leg level, left leg, sequela
  • S84.809 - Injury of other nerves at lower leg level, unspecified leg
  • S84.809A - Injury of other nerves at lower leg level, unspecified leg, initial encounter
  • S84.809D - Injury of other nerves at lower leg level, unspecified leg, subsequent encounter
  • S84.809S - Injury of other nerves at lower leg level, unspecified leg, sequela
  • S84.9 - Injury of unspecified nerve at lower leg level
  • S84.90 - Injury of unspecified nerve at lower leg level, unspecified leg
  • S84.90XA - Injury of unspecified nerve at lower leg level, unspecified leg, initial encounter
  • S84.90XD - Injury of unspecified nerve at lower leg level, unspecified leg, subsequent encounter
  • S84.90XS - Injury of unspecified nerve at lower leg level, unspecified leg, sequela
  • S84.91 - Injury of unspecified nerve at lower leg level, right leg
  • S84.91XA - Injury of unspecified nerve at lower leg level, right leg, initial encounter
  • S84.91XD - Injury of unspecified nerve at lower leg level, right leg, subsequent encounter
  • S84.91XS - Injury of unspecified nerve at lower leg level, right leg, sequela
  • S84.92 - Injury of unspecified nerve at lower leg level, left leg
  • S84.92XA - Injury of unspecified nerve at lower leg level, left leg, initial encounter
  • S84.92XD - Injury of unspecified nerve at lower leg level, left leg, subsequent encounter
  • S84.92XS - Injury of unspecified nerve at lower leg level, left leg, sequela

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code S84:


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.

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

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.

7th Character

7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.

Information for Patients


Leg Injuries and Disorders

Your legs are made up of bones, blood vessels, muscles, and other connective tissue. They are important for motion and standing. Playing sports, running, falling, or having an accident can damage your legs. Common leg injuries include sprains and strains, joint dislocations, and fractures.

These injuries can affect the entire leg, or just the foot, ankle, knee, or hip. Certain diseases also lead to leg problems. For example, knee osteoarthritis, common in older people, can cause pain and limited motion. Problems in your veins in your legs can lead to varicose veins or deep vein thrombosis.


[Learn More]

Peripheral Nerve Disorders

Also called: Neuritis, Peripheral neuritis, Peripheral neuropathy

Your peripheral nerves are the ones outside your brain and spinal cord. Like static on a telephone line, peripheral nerve disorders distort or interrupt the messages between the brain and the rest of the body.

There are more than 100 kinds of peripheral nerve disorders. They can affect one nerve or many nerves. Some are the result of other diseases, like diabetic nerve problems. Others, like Guillain-Barre syndrome, happen after a virus infection. Still others are from nerve compression, like carpal tunnel syndrome or thoracic outlet syndrome. In some cases, like complex regional pain syndrome and brachial plexus injuries, the problem begins after an injury. Some people are born with peripheral nerve disorders.

Symptoms often start gradually, and then get worse. They include

Treatment aims to treat any underlying problem, reduce pain and control symptoms.

NIH: National Institute of Neurological Disorders and Stroke


[Learn More]

Code History

  • 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 (First year ICD-10-CM implemented into the HIPAA code set)