ICD-10 Code G71.20 – Congenital myopathy, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G71.20 – Congenital myopathy, unspecified
What it is
G71.20 identifies a congenital myopathy when the exact subtype is not documented. It refers to a muscle disorder present from birth or early life, with weakness caused by an underlying structural muscle abnormality.
Clinical signs
Clinical features vary; refer to documentation. Common findings include hypotonia, delayed motor milestones, proximal weakness, and poor muscle tone. Diagnosis may be supported by neuromuscular evaluation, but you should code only what is documented.
When to use this code
Use G71.20 when the provider documents congenital myopathy without naming a specific type, such as nemaline, centronuclear, or myotubular myopathy. It also fits when the record confirms a congenital myopathy but does not provide enough detail for a more specific code.
If the note later identifies a specific congenital myopathy subtype, you should code the more precise diagnosis instead. Check documentation for laterality, associated syndromes, or additional neuromuscular findings that may affect coding.
Do not use for
Do not use this code for acquired myopathies, muscular dystrophies, or generalized weakness without a documented congenital myopathy. If the record names a specific congenital myopathy, choose that code instead.
Coding tip
Query the provider when the record says “myopathy” but does not clearly state congenital origin or subtype.