AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2026 Issue 1; Ask the Editor

Dementia and Hypothyroidism

A patient with hypothyroidism and dementia presents for a routine medical encounter. It appears that the ICD-10-CM classification presumes a relationship between these two conditions based on the Alphabetic Index entry for Dementia in hypothyroidism, acquired. Is it appropriate to apply ICD-10-CM Official Guidelines for Coding and Reporting Section I.A.15, and presume a relationship between hypothyroidism and dementia? Or does the advice regarding dementia and epilepsy in Coding Clinic, Second Quarter 2024, pages 8-9, apply to these conditions indicating a need for a documented “cause and effect” relationship? ...

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