ICD-10 Code E05.40 – Thyrotoxicosis factitia without thyrotoxic crisis or storm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.40 – Thyrotoxicosis factitia without thyrotoxic crisis or storm
What it is
This code identifies thyrotoxicosis caused by taking thyroid hormone from outside the body. Use it when documentation shows excess thyroid hormone exposure without crisis or storm.
Clinical signs
Clinical features may include weight loss, palpitations, tremor, heat intolerance, or anxiety. Clinical features vary; refer to documentation, and confirm the provider links them to factitious thyroid hormone use.
When to use this code
Use E05.40 when the record states thyrotoxicosis is due to exogenous thyroid hormone, such as overreplacement or intentional ingestion. Apply it when there is no documentation of thyrotoxic crisis or storm. If the cause is unclear, check documentation before assigning the code.
Do not use for
Do not use this code for thyrotoxicosis from intrinsic thyroid disease, such as Graves’ disease. Do not use it when the chart documents thyroid storm or crisis; code that condition instead.
Coding tip
Look for explicit provider wording like “factitia,” “exogenous,” or “thyroid hormone overuse” before coding E05.40.