This category applies to presentations in which symptoms characteristic of delirium that cause clinically significant distress or impairment in social, occupational, or other impor- tant areas of functioning predominate but do not meet the full criteria for delirium or any of the disorders in the neurocognitive disorders diagnostic class. The unspecified delirium category is used in situations in which the clinician chooses not to specify the reason that the criteria are not met for delirium, and includes presentations for which there is insuffi- cient information to make a more specific diagnosis (e.g., in emergency room settings).
A. Evidence of significant cognitive decline from a previous level of performance in one or more cognitive domains (complex attention. executive function, learning and mem- ory, language, perceptuaI—motor, or social cognition) based on: 1. Concern ot the individual, a knowledgeable informant, or the clinician that there has 2. A substantial impairment in cognitive performance. preferably documented by stan- dardized neuropsychological testing or, in its absence, another quantified clinical assessment.
B. The cognitive deficits interfere with independence in everyday activities (i.e., at a min- imum, requiring assistance with complex instrumental activities of daily living such as paying bills or managing medications).
C. The cognitive deficits do not occur exclusively in the context of a delirium.
D. The cognitive deficits are not better explained by another mental disorder (e.g., major depressive disorder, schizophrenia).
Specify whether due to:
Alzheimer’s disease (pp. 611—614)
Frontotemporal lobar degeneration (pp. 614—618)
Lewy body disease (pp. 618—621)
Vascular disease (pp. 621—624)
Traumatic brain injury (pp. 624—627)
Substance/medication use (pp. 627-632)
HIV infection (pp. 632—634)
Prion disease (pp. 634—636)
Parkinson’s disease (pp. 636—638)
Huntington's disease (pp. 638—641)
Another medical condition (pp. 641—642)
Multiple etiologies (pp. 642—643)
Unspecified (p. 643)
Coding note: Code based on medical or substance etiology. In some cases, there is need for an additional code for the etiological medical condition, which must immediately pre- cede the diagnostic code for major neurocognitive disorder, as follows:
Probable: 331.0 (G309) Probable: 294.1x 331.83 (G31.84)
Possible: no additional (F02.8x) (Do not use addi- medical code Possible: 331.9 tional code for (631.9)C Alzheimer‘s disease.)
Probable: 331.19 Probable: 294.1x 331.83 (G31.84) (G31.09) (F02.8x) (Do not use addi-
Possible: no additional Possible: 331.9 tional code for medical code (631.9)c frontotemporal disease.)
Probable: 331.82 Probable: 294.1x 331.83 (G31.84) (631.83) (F02.8x) (Do not use addi-
Possible: no additional Possible: 331.9 tional code for medical code (631.9)C Lewy body disease.)
No additional medical Probable: 290.40 331.83 (G31.84) code (F01.5x) (Do not use addi-