ICD-10 Code E05.90 – Thyrotoxicosis, unspecified without thyrotoxic crisis or storm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.90 – Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
What it is
E05.90 identifies thyrotoxicosis when the record does not specify the cause and there is no thyroid storm. It indicates excess thyroid hormone effects, but the documentation is not detailed enough for a more specific code.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include weight loss, heat intolerance, tremor, palpitations, or anxiety, but you should code only what is documented and supported by the provider.
When to use this code
Use this code when the provider documents thyrotoxicosis or hyperthyroidism without naming the etiology, such as Graves disease, toxic nodule, or medication-related causes. It also fits when the chart clearly excludes thyrotoxic crisis or storm but remains nonspecific.
If later documentation identifies a specific type, you should code the more detailed diagnosis instead. Check documentation when the record uses only “hyperthyroidism” or “thyrotoxicosis” without further clarification.
Do not use for
Do not use E05.90 when the provider documents thyrotoxic crisis or storm, or when a more specific thyrotoxicosis code is available. Do not use it for thyroid disorders that are not thyrotoxicosis.
Coding tip
Query for the cause of thyrotoxicosis before defaulting to E05.90, because unspecified coding should be your last choice.