infarcts and leukoencephalopathy) evidence of cerebrovascular disease is present.
Possible vascular neuroc ognitive disorder  is diagnosed if the clinical criteria are met
but neuroimaging is not available and the tem poral relationship of the neurocognitive syn-
drome with one or more cerebrovascular events is not established.
Coding note:  For probable major vascular neurocognitive disorder, with behavioral dis-
turbance, code 290.40 (F01.51). For probable major vascular neurocognitive disorder,
without behavioral disturbance, code 290.40 (F01.50). For possible major vascular neuro-
cognitive disorder, with or without behavioral disturbance, code 331.9 (G31.9).  An addi-
tional medical code for the cerebrovascular disease is not needed.
For mild vascular neurocognitive disorder, code 331.83 (G31.84). ( Note:  Do not use an
additional code for the vascular disease. Behavioral disturbance cannot be coded but
should still be indicated in writing.)
Diagnostic Features
The diagnosis of major or mild  vascular neurocognitive diso rder (NCD) requires the es-
tablishment of an NCD (Criterion A) and the determination that cere brovascular disease is
the dominant if not exclusive pathology that accounts for the cognitive deficits (Criteria B
and C). Vascular etiology may range from large vessel stroke to micr ovascular disease; the