neurocognitive disorder due to multiple sclerosis, without behavioral disturbance).
For mild neurocognitive disorder due to another medical condition, code 331.83 (G31.84).
(Note:  Do not  use the additional code for the other medical condition. Behavioral distur-
bance cannot be coded but should still be indicated in writing.)
Diagnostic Features
A number of other medical co nditions can cause neurocognitive disorders (NCDs). These
conditions include structural lesions (e.g., primary or secondary brain tumors, subdural
hematoma, slowly progressive or normal-press ure hydrocephalus), hypoxia related to hy-
poperfusion from heart failure, endocrine co nditions (e.g., hypothyroidism, hypercalce-
mia, hypoglycemia), nutritional conditions (e.g., deficiencies of thiamine or niacin), other
infectious conditions (e.g., neurosyphilis, cryptococcosis), im mune disorders (e.g., tempo-
ral arteritis, systemic lupus erythematosus), hepatic or rena l failure, metabolic conditions
(e.g., Kufs’ disease, adrenoleukodystrophy, metachromatic leukodystrophy, other storage
diseases of adulthood and childhood), and ot her neurological conditions (e.g., epilepsy,
multiple sclerosis). Unusual causes of central nervous system injury, such as electrical
shock or intracranial radiation, are generally evident from the history. The temporal asso-
ciation between the onset or exacerbation of  the medical condition and the development of
the cognitive deficit offers the greatest supp ort that the NCD is induced by the medical
condition. Diagnostic certainty regarding this relationship may be increased if the neuro-
cognitive deficits ameliorate partially or stab ilize in the context of treatment of the medical