ICD-10 Code G71.13 – Myotonic chondrodystrophy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G71.13 – Myotonic chondrodystrophy
What it is
G71.13 identifies myotonic chondrodystrophy, a rare inherited disorder affecting muscle function and skeletal development. It is used when the record specifically documents this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Standard references describe myotonia with delayed muscle relaxation and characteristic skeletal abnormalities consistent with a chondrodystrophy pattern.
When to use this code
Use this code when the provider documents myotonic chondrodystrophy as the confirmed diagnosis. It may also apply when the condition is the reason for evaluation, follow-up, or ongoing management. Check the note for the exact terminology and whether the disorder is current or historical.
Do not use for
Do not use it for other myotonic disorders or unrelated skeletal dysplasias unless the record specifically names myotonic chondrodystrophy. If documentation is unclear, check documentation.
Coding tip
Code only when the diagnosis is explicitly stated; do not infer it from isolated muscle or bone findings.