Separation of muscle (nontraumatic), unspecified lower leg

This code signifies a spontaneous, non-traumatic tearing or detachment of muscle fibers in an unspecified lower leg. This condition is typically due to overuse, muscle imbalance, or degenerative changes, rather than an acute injury from an external force.

Apply this code when documentation indicates a muscle separation in the lower leg without a clear traumatic event, such as a fall or direct impact. This is appropriate when the specific muscle involved or the laterality (right/left) is not specified in the medical record.

• Ensure documentation explicitly states "nontraumatic" or implies a spontaneous onset.
• Avoid using this code if a specific muscle (e.g., gastrocnemius, soleus) or laterality is documented; instead, use a more specific M62.06- subcategory.
• Do not confuse with muscle strains (S86.-) which are traumatic injuries.