ICD-10-CM Code G56.90

Unspecified mononeuropathy of unspecified upper limb

Version 2021 Billable Code

Valid for Submission

G56.90 is a billable code used to specify a medical diagnosis of unspecified mononeuropathy of unspecified upper limb. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code G56.90 might also be used to specify conditions or terms like compression neuropathy of upper limb, digital nerve lesion, lesion of lateral cutaneous nerve of forearm, lesion of medial cutaneous nerve of forearm, lesion of sensory branch of radial nerve, mononeuropathy of upper limb, etc

Short Description:Unspecified mononeuropathy of unspecified upper limb
Long Description:Unspecified mononeuropathy of unspecified upper limb


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

  • Compression neuropathy of upper limb
  • Digital nerve lesion
  • Lesion of lateral cutaneous nerve of forearm
  • Lesion of medial cutaneous nerve of forearm
  • Lesion of sensory branch of radial nerve
  • Mononeuropathy of upper limb
  • Musculocutaneous nerve lesion
  • Neuropathy of upper limb
  • Neuropathy of upper limb due to infection
  • Neuropathy of upper limb due to metabolic disorder
  • Suprascapular nerve lesion
  • Suprascapular neuropathy
  • Upper limb nerve lesion

Convert G56.90 to ICD-9

  • 354.9 - Mononeuritis arm NOS (Approximate Flag)

Code Classification

  • Diseases of the nervous system (G00–G99)
    • Nerve, nerve root and plexus disorders (G50-G59)
      • Mononeuropathies of upper limb (G56)

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
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients

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

  • 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

  • Axillary nerve dysfunction (Medical Encyclopedia)
  • Chronic inflammatory polyneuropathy (Medical Encyclopedia)
  • Common peroneal nerve dysfunction (Medical Encyclopedia)
  • Distal median nerve dysfunction (Medical Encyclopedia)
  • Femoral nerve dysfunction (Medical Encyclopedia)
  • Glossopharyngeal neuralgia (Medical Encyclopedia)
  • Metabolic neuropathies (Medical Encyclopedia)
  • Mononeuritis multiplex (Medical Encyclopedia)
  • Neuralgia (Medical Encyclopedia)
  • Neuropathy secondary to drugs (Medical Encyclopedia)
  • Peripheral neuropathy (Medical Encyclopedia)
  • Radial nerve dysfunction (Medical Encyclopedia)
  • Sensorimotor polyneuropathy (Medical Encyclopedia)
  • Tibial nerve dysfunction (Medical Encyclopedia)
  • Ulnar nerve dysfunction (Medical Encyclopedia)

[Learn More]