occur exclusively during the course of a delirium.
Coding note: For major neurocognitive disorder due to multiple etiologies, with behavioral
disturbance, code 294.11 (F02.81) ; for major neurocognitive disorder due to multiple etiolo-
gies, without behavioral disturbance, code 294.10 (F02.80). All of the etiological medical
conditions (with the exception of  vascular disease) should be coded and listed separately
immediately before major neurocognitive diso rder due to multiple etiologies (e.g., 331.0
[G30.9]  Alzheimer’s disease; 331.82 [G31.83]  Lewy body disease; 294.11 [F02.81]  major
neurocognitive disorder due to multiple  etiologies, with behavioral disturbance).
When a cerebrovascular etiology is contributin g to the neurocognitive disorder, the diagno-
sis of vascular neurocognitive disorder should be listed in addition to major neurocognitive
disorder due to multiple etiologies. For example, for a presentation of major neurocognitive
disorder due to both Alzheimer’s disease and va scular disease, with behavioral disturbance,
code the following: 331.0 (G30.9) Alzheimer’s disease; 294.11 (F02.81)  major neurocogni-
tive disorder due to multiple etiologies, with behavioral disturbance; 290.40 (F01.51)  major
vascular neurocognitive disorder, with behavioral disturbance.
For mild neurocognitive disorder due to multiple etiologies, code 331.83 (G31.84).  (Note:
Do not use the additional codes for the etiologies. Behavioral disturbance cannot be coded
but should still be indicated in writing.)