AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2016 Issue 4; Ask the Editor

Lewy Body Dementia

When referencing the Alphabetic Index under Dementia, Lewy body, the coder is directed to codes G31.83, Dementia with Lewy bodies, and [F02.80], Dementia in other diseases classified elsewhere without behavioral disturbance. When referencing the Tabular List under category F02-, Dementia in other diseases classified elsewhere, there is an instructional note to “Code first the underlying physiological condition, such as:” and the list includes Dementia with Lewy bodies (G31.83), which is consistent with the Alphabetic Index. However, there is also an Excludes1 note under category F02- that prohibits assigning dementia with Parkinsonism (G31.83). Based on this inconsistency in the Tabular, how should Lewy body dementia be coded?   ...

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