ICD-10-CM Code S04.9XXA

Injury of unspecified cranial nerve, initial encounter

Version 2020 Billable Code

Valid for Submission

S04.9XXA is a billable code used to specify a medical diagnosis of injury of unspecified cranial nerve, initial encounter. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code S04.9XXA might also be used to specify conditions or terms like avulsion of cranial nerve, chemical cranial nerve injury, complete division of cranial nerve, contusion of cranial nerve, cranial nerve compression, injuries of brain and cranial nerves with injuries of nerves and spinal cord at neck level, etc

Short Description:Injury of unspecified cranial nerve, initial encounter
Long Description:Injury of unspecified cranial nerve, initial encounter


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

  • Avulsion of cranial nerve
  • Chemical cranial nerve injury
  • Complete division of cranial nerve
  • Contusion of cranial nerve
  • Cranial nerve compression
  • Injuries of brain and cranial nerves with injuries of nerves and spinal cord at neck level
  • Injury of cranial nerve
  • Injury of superficial nerves of head AND/OR neck
  • Neuropathy due to ionizing radiation
  • Partial division of cranial nerve
  • Radiation injury of cranial nerve
  • Thermal injury of cranial nerve
  • Traction injury of cranial nerve

Convert S04.9XXA to ICD-9

  • 951.9 - Injury cranial nerve NOS (Approximate Flag)

Code Classification

  • Injury, poisoning and certain other consequences of external causes (S00–T98)
    • Injuries to the head (S00-S09)
      • Injury of cranial nerve (S04)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

Peripheral Nerve Disorders

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

  • Numbness
  • Pain
  • Burning or tingling
  • Muscle weakness
  • Sensitivity to touch

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

NIH: National Institute of Neurological Disorders and Stroke

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