1.  Make sure we are not diagnosing schizophrenia incorrectly.  Essentially no one presents with schizophrenia over 60 y/o and certainly not if they also have dementia.  

2.  The F06 group of ICD10 codes is useful to describe dementia associated psychiatric issues. 

ICD-10-CM Diagnosis Code F06.0 
Psychotic disorder with hallucinations due to known physiological condition

 ICD-10-CM Diagnosis Code F06.1
Catatonic disorder due to known physiological condition

 ICD-10-CM Diagnosis Code F06.2
Psychotic disorder with delusions due to known physiological condition

 ICD-10-CM Diagnosis Code F06.3 
Mood disorder due to known physiological condition

 ICD-10-CM Diagnosis Code F06.4 
Anxiety disorder due to known physiological condition

 ICD-10-CM Diagnosis Code F06.8 
Other specified mental disorders due to known physiological condition

 ICD-10-CM Diagnosis Code F06.30 
Mood disorder due to known physiological condition, unspecified

 ICD-10-CM Diagnosis Code F06.31 
Mood disorder due to known physiological condition with depressive features

 ICD-10-CM Diagnosis Code F06.32 Mood disorder due to known physiological condition with major depressive-like episode

 ICD-10-CM Diagnosis Code F06.33 
Mood disorder due to known physiological condition with manic features

 ICD-10-CM Diagnosis Code F06.34 
Mood disorder due to known physiological condition with mixed features