Major or Mild Neurocognitive Disorder Due to Another Medical Condition 641
Other movement disorders. Huntington’s disease must also be differentiated from other
disorders or conditions associated with chorea, such as Wilson’s disease, drug-induced
tardive dyskinesia, Sydenham’s chorea, systemic  lupus erythematosus, or senile chorea.
Rarely, individuals may present with a course similar to that of Huntington’s disease but
without positive genetic testin g; this is considered to be  a Huntington’s disease pheno-
copy that results from a variet y of potential genetic factors.
Major or Mild Neurocognitive Disorder
 Due to Another Medical Condition
Diagnostic Criteria  
A. The criteria are met for major or mild neurocognitive disorder.
B. There is evidence from the history, physical examination, or laboratory findings that the
neurocognitive disorder is the pathophysi ological consequence of another medical
condition. 
C. The cognitive deficits are not better explained by another mental disorder or another
specific neurocognitive disorder (e.g., Alzheimer’s disease, HIV infection).
Coding note: For major neurocognitive disorder due  to another medical condition, with
behavioral disturbance, code first the other medical condition, followed by the major neu-
rocognitive disorder due to another medical condition, with behavioral disturbance (e.g.,
340 [G35] multiple sclerosis, 294.11 [F02.81]  major neurocognitive disorder due to multi-
ple sclerosis, with behavioral disturbance). For major neurocognitive disorder due to an-
other medical condition, without behavioral disturbance, code first the other medical
condition, followed by the major neurocognitive disorder due to another medical condition,
without behavioral disturbance (e.g., 340 [G35] multiple sclerosis, 294.10 [F02.80]  major