AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2017 Issue 1; Ask the Editor

Toxic Encephalopathy due to Poisoning

A patient with bipolar disorder presents to the Emergency Department (ED) with mental status change, diarrhea, nausea and vomiting after ingesting ten lithium carbonate tablets with suicidal intent. She is admitted to the hospital, treated for acute lithium toxicity and discharged to a skilled nursing facility. The provider’s diagnostic statement listed toxic encephalopathy due to lithium toxicity. Coding professionals are confused about the instructional note under code G92, which states “code first (T51-T65) to identify toxic agent,” because the code for lithium poisoning/toxicity is outside of the range. How is toxic encephalopathy due to lithium poisoning/toxicity coded? ...

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