The International Classification of Sleep Disorders (ICSD) uses a multiaxial system for stating and coding diagnoses both in clinical reports or for database purposes.
Additional codes are included for procedures and physical signs of particular interest to sleep disorders clinicians and researchers.
In 2005, the International Classification of Sleep Disorders underwent minor updates and modifications resulting in version 2 (ICSD-2).
The classification was much more discussed by experts of the field and led to the third edition of the ICSD.
The International Classification of Diseases (ICD-9-CM and ICD-10-CM) codes corresponding to each specific diagnosis can be found within the ICSD-3.
These two types are distinguished by the presence or absence of cataplexy and the cerebrospinal fluid hypocretin-1 level.
Some lie on the continuum between normal and abnormal: as an example, snoring without associated airway compromise, sleep disturbance, or other consequences is essentially normal, whereas heavy snoring is often part of obstructive sleep apnea.
Furthermore, some features are no longer disorders and are reunited in The AASM [American Academy of Sleep Medicine] Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications.
It is divided into 7 main categories: Other sleep-related symptoms or events that do not meet the standard definition of a sleep disorder.