REM sleep behavior disorder

This code identifies a parasomnia characterized by the intermittent loss of muscle atonia during REM sleep, leading to the enactment of dreams. Patients often vocalize and exhibit complex motor behaviors, sometimes violent, during sleep.

Assign this code when documentation confirms a diagnosis of REM sleep behavior disorder, typically based on polysomnography showing REM sleep without atonia (RSWA) and clinical history of dream enactment. This diagnosis is often made by a neurologist or sleep specialist.

• Differentiate from other parasomnias like sleepwalking (F51.3) or night terrors (F51.4).
• Always review polysomnography reports and physician notes for definitive diagnosis.
• Consider co-occurring neurological conditions, such as Parkinson's disease, which frequently precede or accompany RBD.