2019 ICD-10-CM Diagnosis Code G71.12

Myotonia congenita

    2016 2017 2018 2019 Billable/Specific Code
  • G71.12 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM G71.12 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of G71.12 - other international versions of ICD-10 G71.12 may differ.
Applicable To
  • Acetazolamide responsive myotonia congenita
  • Dominant myotonia congenita [Thomsen disease]
  • Myotonia levior
  • Recessive myotonia congenita [Becker disease]
The following code(s) above G71.12 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G71.12:
  • G00-G99
    2019 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
  • G71
    ICD-10-CM Diagnosis Code G71

    Primary disorders of muscles

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • arthrogryposis multiplex congenita (Q74.3)
    • metabolic disorders (E70-E88)
    • myositis (M60.-)
    Primary disorders of muscles
Approximate Synonyms
  • Congenital myotonia, autosomal dominant form
  • Myotonia, autosomal dominant
Clinical Information
  • Congenital genetic disease characterized by tonic spasm and rigidity of certain muscles when a voluntary movement is attempted; also known as thomsen's disease.
ICD-10-CM G71.12 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 091 Other disorders of nervous system with mcc
  • 092 Other disorders of nervous system with cc
  • 093 Other disorders of nervous system without cc/mcc

Convert G71.12 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change

Diagnosis Index entries containing back-references to G71.12:
  • Becker's
    • disease
      • myotonia congenita, recessive form G71.12
  • Disease, diseased - see also Syndrome
    • Becker
      • myotonia congenita G71.12
    • Thomsen G71.12
  • Myotonia (acquisita) (intermittens) M62.89
    ICD-10-CM Diagnosis Code M62.89

    Other specified disorders of muscle

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Muscle (sheath) hernia
    • congenita G71.12 (acetazolamide responsive) (dominant) (recessive)
    • levior G71.12
  • Thomsen disease G71.12

ICD-10-CM Codes Adjacent To G71.12
G70.89 Other specified myoneural disorders
G70.9 Myoneural disorder, unspecified
G71 Primary disorders of muscles
G71.0 Muscular dystrophy
G71.00 …… unspecified
G71.01 Duchenne or Becker muscular dystrophy
G71.02 Facioscapulohumeral muscular dystrophy
G71.09 Other specified muscular dystrophies
G71.1 Myotonic disorders
G71.11 Myotonic muscular dystrophy
G71.12 Myotonia congenita
G71.13 Myotonic chondrodystrophy
G71.14 Drug induced myotonia
G71.19 Other specified myotonic disorders
G71.2 Congenital myopathies
G71.3 Mitochondrial myopathy, not elsewhere classified
G71.8 Other primary disorders of muscles
G71.9 Primary disorder of muscle, unspecified
G72 Other and unspecified myopathies
G72.0 Drug-induced myopathy
G72.1 Alcoholic myopathy

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.