AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2019 Issue 2; Ask the Editor

Delirium of Unknown Etiology

The patient is a 71-year-old male admitted for weakness, who became delirious during the stay. The provider documented “Delirium unclear cause. Continue neuro checks, Lexapro and Abilify.” The Index to Diseases under the terms “delirium, due to, general medical condition” directs to code F05, Delirium due to known physiological condition. However, this code assignment does not appear accurate. What is the appropriate code assignment for delirium of unknown etiology? ...

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