AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2017 Issue 2; Ask the Editor

Parkinson’s Dementia versus Parkinsonism

A patient diagnosed with dementia due to Parkinson’s disease and aggressive behavior is admitted for treatment. The ICD-10-CM Alphabetic Index to Diseases and Injuries for Parkinson’s dementia with behavioral disturbance seems inconsistent. Depending on which Index entry is used, either code G20, Parkinson’s disease or code G31.83, Dementia with Lewy bodies, is assigned. The Alphabetic Index entry for “Dementia” has subentries for Parkinsonism (G31.81) and Parkinson’s disease (G20). However, the Index entry for Parkinson’s disease directs to see Parkinsonism. This instructional note is mandatory and indicates Parkinson’s disease is coded as Parkinsonism. What is the appropriate code assignment for Parkinson’s dementia with aggressive behavior? ...

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