Orthopedic Coding Alert

Reader Questions:

Report This Code for Myotonic Atrophica

Question: Encounter notes indicate that the provider treated a patient with myotonic atrophica. What is the correct diagnosis code for this condition?

Florida Subscriber

Answer: You should report G71.11(Myotonic muscular dystrophy) for this patient’s condition. Myotonic atrophica is synonymous with myotonic muscular dystrophy, per ICD-10.

There are an inordinate amount of synonyms listed under the codes in the G71.1- set. Here are those codes, along with their synonyms:

G71.11

Synonyms

  • Dystrophia myotonica [Steinert]
  • Myotonia atrophica
  • Myotonic dystrophy
  • Proximal myotonic myopathy (PROMM)
  • Steinert disease

G71.12 (Myotonia congenita)

Synonyms

  • Acetazolamide responsive myotonia congenita
  • Dominant myotonia congenita [Thomsen disease]
  • Myotonia levior
  • Recessive myotonia congenita [Becker disease]

G71.13 (Myotonic chondrodystrophy)

Synonyms

  • Chondrodystrophic myotonia
  • Congenital myotonic chondrodystrophy
  • Schwartz-Jampel disease

G71.14 (Drug induced myotonia)

G71.19 (Other specified myotonic disorders)

Synonyms

  • Myotonia fluctuans
  • Myotonia permanens
  • Neuromyotonia [Isaacs]
  • Paramyotonia congenita (of von Eulenburg)
  • Pseudomyotonia
  • Symptomatic myotonia.


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