ICD-11 Criteria for Neurocognitive Disorders (BlockL1‑6D7)

Neurocognitive disorders are characterised by primary clinical deficits in cognitive functioning that are acquired rather than developmental. That is, neurocognitive disorders do not include disorders characterised by deficits in cognitive function that are present from birth or that typically arise during the developmental period, which are classified in the grouping neurodevelopmental disorders. Rather, neurocognitive disorders represent a decline from a previously attained level of functioning. Although cognitive deficits are present in many mental disorders (e.g., schizophrenia, bipolar disorders), only disorders whose core features are cognitive are included in the neurocognitive Disorders grouping. In cases where the underlying pathology and etiology for neurocognitive disorders can be determined, the identified etiology should be classified separately.

Exclusions:

Neurodevelopmental disorders (BlockL1‑6A0)

Coded Elsewhere: Secondary neurocognitive syndrome (6E67)

6D70 Delirium

Delirium is characterized by a disturbance of attention, orientation, and awareness that develops within a short period of time, typically presenting as significant confusion or global neurocognitive impairment, with transient symptoms that may fluctuate depending on the underlying causal condition or etiology. Delirium often includes disturbance of behaviour and emotion, and may include impairment in multiple cognitive domains. A disturbance of the sleep-wake cycle, including reduced arousal of acute onset or total sleep loss with reversal of the sleep-wake cycle, may also be present. Delirium may be caused by the direct physiological effects of a medical condition not classified under mental, behavioural or neurodevelopmental disorders, by the direct physiological effects of a substance or medication, including withdrawal, or by multiple or unknown etiological factors.

6D70.0 Delirium due to disease classified elsewhere

All definitional requirements for delirium are met. There is evidence from history, physical examination, or laboratory findings that Delirium is caused by the direct physiological consequences of a disorder or disease classified elsewhere.

Coding Note: Identified etiology should be classified separately.

6D70.1 Delirium due to psychoactive substances including medications

All definitional requirements for delirium are met. There is evidence from history, physical examination, or laboratory findings that the delirium is caused by the direct physiological effects of a substance or medication (including withdrawal). If the specific substance inducing the delirium has been identified, it should be classified using the appropriate subcategory (e.g., alcohol-induced delirium).

Coded Elsewhere:

Alcohol-induced delirium (6C40.5)
Cannabis-induced delirium (6C41.5)
Synthetic cannabinoid-induced delirium (6C42.5)
Opioid-induced delirium (6C43.5)
Sedative, hypnotic or anxiolytic-induced delirium (6C44.5)
Cocaine-induced delirium (6C45.5)
Stimulant-induced delirium including amphetamines, methamphetamine or methcathinone (6C46.5)
Synthetic cathinone-induced delirium (6C47.5)
Hallucinogen-induced delirium (6C49.4)
Volatile inhalant-induced delirium (6C4B.5)
MDMA or related drug-induced delirium, including MDA (6C4C.5)
Dissociative drug-induced delirium including ketamine or PCP (6C4D.4)
Delirium induced by other specified psychoactive substance including medications (6C4E.5)
Delirium induced by multiple specified psychoactive substances including medications (6C4F.5)
Delirium induced by unknown or unspecified psychoactive substance (6C4G.5)

6D70.2 Delirium due to multiple etiological factors

All definitional requirements for delirium are met. There is evidence from history, physical examination, or laboratory findings that the delirium is attributable to multiple etiological factors, which may include disorders or diseases not classified under mental and behavioural disorders, substance intoxication or withdrawal, or a medication.

Coding Note: Identified etiologies should be classified separately.

6D70.Y Delirium, other specified cause
6D70.Z Delirium, unspecified or unknown cause

REFERENCE:

International Classification of Diseases Eleventh Revision (ICD-11). Geneva: World Health Organization; 2022. License: CC BY-ND 3.0 IGO.

https://creativecommons.org/licenses/by-nc-nd/3.0/igo/

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