International Classification of Sleep Disorders (ICSD)« Back to Glossary Index
The International Classification of Sleep Disorders (ICSD) is the authoritative clinical text for the diagnosis of sleep disorders, published by the American Academy of Sleep Medicine. The 3rd edition, ICSD-3, was published in 2014, replacing ICSD-2 (which had replaced ICSD-1 in 2005).
The ICSD-3 groups sleep disorders into six major categories – 1) insomnia, 2) sleep-related breathing disorders, 3) central disorders of hypersomnolence, 4) circadian rhythm sleep-wake disorders, 5) parasomnias, and 6) sleep-related movement disorders. A seventh category is for “other sleep disorders” not captured by the six major categories. Sleep disorders including idiopathic hypersomnia, narcolepsy (both types 1 and 2), and Kleine-Levin syndrome are categorized as “central disorders of hypersomnolence.”
For an overview of current diagnosis methods, see our Classification of Hypersomnias web page. For the ICSD-3’s diagnostic criteria for idiopathic hypersomnia, see our IH Summary.