Is Periodic Limb Movement Disorder (PLMD) classified as a disorder in the Diagnostic and Statistical Manual of Mental Disorders (DSM), the International Classification of Sleep Disorders (ICSD), or the American Academy of Sleep Medicine (AASM) taxonomy?

PLMD Classification Status

Periodic Limb Movement Disorder (PLMD) is formally recognized and classified as a disorder by the ICSD (International Classification of Sleep Disorders) and the AASM (American Academy of Sleep Medicine), but NOT as a standalone disorder in the DSM (Diagnostic and Statistical Manual of Mental Disorders). 1

Classification Details

ICSD and AASM Recognition

The AASM's 2025 clinical practice guideline explicitly defines PLMD as a distinct diagnostic entity with specific criteria 1:

• PLMD is classified as a sleep-related movement disorder in the ICSD-3 (third edition of the International Classification of Sleep Disorders) 2
• The AASM provides formal diagnostic criteria and treatment recommendations for PLMD as a recognized disorder 1

Diagnostic criteria per AASM/ICSD include:

1. Frequent periodic limb movements during sleep (>15 events/hour in adults, >5 events/hour in children)
2. Clinically significant sleep disturbance and/or daytime dysfunction not better explained by another disorder
3. Absence of other sleep disorders associated with high PLMS rates (RLS, untreated OSA, REM sleep behavior disorder, narcolepsy) 1

DSM Status

The DSM does not classify PLMD as a standalone disorder. Analysis of clinical significance criteria across sleep disorder classifications shows that PLMD is not included among the main sleep disorders in DSM-5-TR 3. The DSM sleep-wake disorders section focuses on different diagnostic categories and does not provide specific diagnostic criteria for PLMD as an independent entity.

Important Clinical Caveat

PLMD is a diagnosis of exclusion 4. The disorder can only be diagnosed when periodic limb movements cause symptoms AND other conditions that commonly produce these movements have been ruled out. Recent systematic review evidence reveals that more than half (55.6%) of published PLMD samples were incompatible with contemporary diagnostic standards, primarily due to exclusionary comorbidities like RLS or untreated sleep-disordered breathing 5. This highlights widespread historical misclassification and emphasizes the importance of rigorous application of current ICSD-3-TR criteria.