2022 ICD-10-CM Code G56.21

Lesion of ulnar nerve, right upper limb

Version 2021

Valid for Submission

ICD-10:G56.21
Short Description:Lesion of ulnar nerve, right upper limb
Long Description:Lesion of ulnar nerve, right upper limb

Code Classification

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

G56.21 is a billable diagnosis code used to specify a medical diagnosis of lesion of ulnar nerve, right upper limb. The code G56.21 is valid during the fiscal year 2022 from October 01, 2021 through September 30, 2022 for the submission of HIPAA-covered transactions.

The ICD-10-CM code G56.21 might also be used to specify conditions or terms like entrapment of right ulnar nerve, entrapment of ulnar nerve at right wrist, lesion of right ulnar nerve, neuritis of right ulnar nerve, tardy right ulnar nerve palsy , tardy ulnar nerve palsy, etc.

Approximate Synonyms

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

Convert G56.21 to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code G56.21 its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

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

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

NIH: National Institute of Neurological Disorders and Stroke


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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)