ICD-10 Code E05 – Thyrotoxicosis [hyperthyroidism] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05 – Thyrotoxicosis [hyperthyroidism]
What it is
E05 identifies thyrotoxicosis, a state caused by excess thyroid hormone activity. Use it when the record documents hyperthyroidism or thyrotoxicosis without a more specific subtype.
Clinical signs
Typical findings include weight loss, heat intolerance, tremor, palpitations, anxiety, and enlarged thyroid. Clinical features vary; refer to documentation.
When to use this code
Use E05 when the provider documents thyrotoxicosis or hyperthyroidism and does not name a more specific cause. It may also fit when the note describes an overactive thyroid without further detail. Check documentation if the etiology is stated, such as toxic nodular disease or Graves disease.
Do not use for
Do not use E05 for hypothyroidism or for thyroid disorders with a more specific ICD-10 code. If the chart only says “thyroid disease” or the exact diagnosis is unclear, check documentation.
Coding tip
Code to the highest documented specificity, and confirm whether the record identifies a cause or complication before assigning the unspecified E05 code.