Periodic limb movement disorder

This code identifies a sleep-related movement disorder characterized by repetitive, involuntary muscle contractions and relaxations, primarily in the lower limbs, occurring during sleep. These movements typically involve the ankle, knee, and hip joints, leading to sleep disruption and daytime fatigue. It is distinct from restless legs syndrome, though the two conditions can co-occur.

Assign this code when documentation explicitly states a diagnosis of periodic limb movement disorder (PLMD) based on polysomnography findings. The diagnosis should be supported by a sleep study demonstrating a periodic limb movement index (PLMI) above established thresholds, often accompanied by associated sleep disturbance or daytime symptoms.

• Do not confuse with restless legs syndrome (RLS); while often comorbid, they are distinct diagnoses.
• Ensure documentation specifies "periodic limb movement disorder" and not just "limb movements during sleep."
• Code any associated sleep disturbances or underlying conditions, such as narcolepsy or sleep apnea, separately.