ICD-10-CM Code G71.1

Myotonic disorders

Version 2020 Non-Billable Code

Not Valid for Submission

G71.1 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of myotonic disorders. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:G71.1
Short Description:Myotonic disorders
Long Description:Myotonic disorders

Consider the following ICD-10 codes with a higher level of specificity:

  • G71.11 - Myotonic muscular dystrophy
  • G71.12 - Myotonia congenita
  • G71.13 - Myotonic chondrodystrophy
  • G71.14 - Drug induced myotonia
  • G71.19 - Other specified myotonic disorders

Clinical Information

  • MYOTONIC DISORDERS-. diseases characterized by myotonia which may be inherited or acquired. myotonia may be restricted to certain muscles e.g. intrinsic hand muscles or occur as a generalized condition.

Code Classification

  • Diseases of the nervous system (G00–G99)
    • Diseases of myoneural junction and muscle (G70-G73)
      • Primary disorders of muscles (G71)

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


Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Causes of muscle disorders include

  • Injury or overuse, such as sprains or strains, cramps or tendinitis
  • A genetic disorder, such as muscular dystrophy
  • Some cancers
  • Inflammation, such as myositis
  • Diseases of nerves that affect muscles
  • Infections
  • Certain medicines

Sometimes the cause is not known.


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