ICD-10 Code E05.11 – Thyrotoxicosis with toxic single thyroid nodule with thyrotoxic crisis or storm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.11 – Thyrotoxicosis with toxic single thyroid nodule with thyrotoxic crisis or storm
What it is
This code identifies severe thyrotoxicosis caused by one toxic thyroid nodule, with crisis or storm. Use it when the record documents a hyperfunctioning single nodule and a life-threatening thyrotoxic state.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include marked hyperthyroid symptoms with acute systemic decompensation, and the chart should support both the toxic nodule and the crisis or storm diagnosis.
When to use this code
Use E05.11 when the provider clearly documents a toxic single thyroid nodule and thyrotoxic crisis or storm in the same encounter. It is appropriate for inpatient or emergency records describing severe thyrotoxicosis from a single functioning nodule. Check documentation if the note only says hyperthyroidism, thyroid storm, or thyroid nodule without linkage.
Do not use for
Do not use this code for uncomplicated toxic single thyroid nodule without crisis or storm. Do not assign it when the record describes a different thyroid disorder, or when the crisis component is not documented.
Coding tip
Confirm that both the toxic nodule and the thyrotoxic crisis or storm are explicitly linked in the provider note before coding.