Duchenne or Becker muscular dystrophy

This code identifies Duchenne or Becker muscular dystrophy, which are X-linked recessive genetic disorders characterized by progressive muscle degeneration and weakness. Both conditions result from mutations in the dystrophin gene, leading to absent or dysfunctional dystrophin protein. Duchenne is typically more severe with earlier onset, while Becker presents with a milder phenotype and later onset.

Apply this code when documentation explicitly states a diagnosis of Duchenne muscular dystrophy or Becker muscular dystrophy. This diagnosis is typically confirmed through genetic testing, muscle biopsy, and clinical presentation. Use for initial diagnosis, follow-up care, and management of these specific muscular dystrophies.

• Differentiate carefully between Duchenne and Becker based on provider documentation; do not assume one over the other.
• Do not use this code for other forms of muscular dystrophy; refer to the appropriate subcategory within G71.0 for other specified types.
• Code any associated manifestations or complications, such as cardiomyopathy (I42.7), scoliosis (M41.-), or respiratory failure (J96.-), as secondary diagnoses.