AA. Substantial cognitive decline in ≥1 domain (complex attention, executive function, learning/memory, language, perceptual-motor, social cognition) based on concern + objective evidence B. Deficits interfere with independence in everyday activities (require assistance with complex IADLs) C. Deficits not occurring exclusively during delirium
BA. Disturbance of attention (reduced ability to direct, focus, sustain, shift attention) and awareness (reduced orientation to environment) B. Develops over short period; represents change from baseline; tends to fluctuate during the day C. Additional disturbance in cognition (memory deficit, disorientation, language, visuospatial ability, or perception)
Common specifiers
AWith behavioural disturbance; Without behavioural disturbance; Mild severity; Moderate severity
BHyperactive; Hypoactive; Mixed level of activity; Acute
Differential flags
AMild NCD (independence preserved); Delirium (acute, fluctuating); MDD with cognitive features (pseudodementia)
BMajor NCD (gradual onset; no fluctuation - delirium superimposed on NCD is common); MDD (no clouded consciousness); Psychotic disorder (gradual onset; consciousness intact)