ICD-10 Code E05.4 – Thyrotoxicosis factitia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.4 – Thyrotoxicosis factitia
What it is
E05.4 identifies thyrotoxicosis caused by taking too much thyroid hormone, whether intentionally or accidentally. It reflects hormone excess from an external source, not overproduction by the thyroid gland.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include symptoms of hyperthyroidism with a history of thyroid hormone use, but the key point is evidence of exogenous hormone exposure.
When to use this code
Use E05.4 when the record states thyrotoxicosis factitia, factitious thyrotoxicosis, or thyroid hormone excess due to prescribed or nonprescribed ingestion. It also fits cases where the clinician documents suppressed thyroid function from exogenous hormone use. Do not infer this code without clear documentation.
Do not use for
Do not use this code for Graves disease, thyroiditis, or other causes of endogenous thyrotoxicosis. If the chart does not clearly link the condition to external thyroid hormone, check documentation.
Coding tip
Assign E05.4 only when the provider documents exogenous thyroid hormone as the cause of thyrotoxicosis.