xxxii DSM-5 Classification
331.9  (G31.9) Major Neurocognitive Disorder Possibly Due to Parkinson’s 
Diseasea, b
331.83  (G31.84) Mild Neurocognitive Disorder  Due to Parkinson’s Diseasea
Major or Mild Neurocognitive Disorder Due to Huntington’s Disease (638)
___.__  (___.__) Major Neurocognitive Disorder Due to Huntington’s Diseaseb
Note:  Code first 333.4 (G10)  Huntington’s disease.
294.11  (F02.81) With behavioral disturbance
294.10  (F02.80) Without behavioral disturbance
331.83  (G31.84) Mild Neurocognitive Disorder Due to Huntington’s Diseasea
Major or Mild Neurocognitive Disorder Due to Another Medical Condition (641)
___.__  (___.__) Major Neurocognitive Disord er Due to Another Medical 
Conditionb
Note:  Code first the other medical condition.
294.11  (F02.81) With behavioral disturbance
294.10  (F02.80) Without behavioral disturbance
331.83  (G31.84) Mild Neurocognitive Disorder Due to Another Medical 
Conditiona
Major or Mild Neurocognitive Disorder  Due to Multiple Etiologies (642)
___.__  (___.__) Major Neurocognitive Disorder Due to Multiple Etiologiesb
Note:  Code first all the etiological medical conditions (with the exception
of vascular disease).
294.11  (F02.81) With behavioral disturbance
294.10  (F02.80) Without behavioral disturbance
331.83  (G31.84) Mild Neurocognitive Disorder Due to Multiple Etiologiesa
Unspecified Neurocognit ive Disorder (643)