ICD-10 Code E05.9 – Thyrotoxicosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.9 – Thyrotoxicosis, unspecified
What it is
E05.9 identifies thyrotoxicosis when the chart confirms excess thyroid hormone effect but does not specify the cause. Use it for hyperthyroid states that are documented as unspecified.
Clinical signs
Common findings include weight loss, heat intolerance, tremor, palpitations, anxiety, and increased bowel activity. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents thyrotoxicosis or hyperthyroidism without naming Graves disease, toxic nodules, or another specific etiology. It also fits when the record confirms a thyrotoxic state but the cause is not stated. You should code the documented diagnosis, not infer the underlying disorder.
Do not use for
Do not use E05.9 if the record identifies a specific cause of thyrotoxicosis, such as Graves disease or toxic multinodular goiter. Do not use it for normal thyroid function or nonspecific symptoms alone.
Coding tip
If the cause is missing, code the unspecified diagnosis only after checking whether the provider documented a more specific thyroid disorder elsewhere in the note.