604 Neurocognitive Disorders
HIV infection 042 (B20) 294.1x (F02.8x) 331.83 (G31.84) 
(Do not use addi-
tional code for HIV 
infection.)
Prion disease 046.79 (A81.9) 294.1x (F02.8x) 331.83 (G31.84)
(Do not use addi-
tional code for 
prion disease.)
Parkinson’s 
diseaseProbable: 332.0 (G20)
Possible: No additional 
medical codeProbable: 294.1x 
(F02.8x)
Possible: 331.9 
(G31.9)c331.83 (G31.84) 
(Do not use addi-
tional code for 
Parkinson’s 
disease.)
Huntington’s 
disease333.4 (G10) 294.1x (F02.8x) 331.83 (G31.84)
(Do not use addi-
tional code for 
Huntington’s 
disease.)
Due to another 
medical conditionCode the other medical 
condition first 
(e.g., 340 [G35] 
multiple sclerosis)294.1x (F02.8x) 331.83 (G31.84)
(Do not use addi-
tional codes for the 
presumed etiologi-
cal medical condi-
tions.)
Due to multiple 
etiologiesCode all of the etiological 
medical conditions first 
(with the exception of 
vascular disease) 294.1x (F02.8x) 
(Plus the code for