Limb girdle muscular dystrophy due to dysferlin dysfunction

This code identifies a specific genetic disorder characterized by progressive weakness and wasting of muscles, primarily affecting the shoulders, upper arms, hips, and thighs. It is caused by a mutation in the DYSF gene, leading to a deficiency or dysfunction of the dysferlin protein, which is crucial for muscle fiber repair.

Assign this code for patients diagnosed with limb-girdle muscular dystrophy (LGMD) where genetic testing or clinical findings confirm dysferlinopathy as the underlying cause. Documentation should explicitly state "dysferlin dysfunction," "dysferlinopathy," or "LGMD type 2B (LGMD2B)" to support its use.

• Ensure documentation specifies the genetic basis as dysferlin dysfunction, not just general limb-girdle muscular dystrophy.
• Do not use this code for other types of LGMD with different genetic etiologies; specific codes exist for those.
• Consider sequencing with codes for associated symptoms or complications, such as muscle weakness (R27.8) or gait abnormalities (R26.89).