ICD-10 Code E05.81 – Other thyrotoxicosis with thyrotoxic crisis or storm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.81 – Other thyrotoxicosis with thyrotoxic crisis or storm
What it is
This code identifies thyrotoxicosis from causes other than the common specified forms, when the patient is also in thyrotoxic crisis or storm. Use it for severe, acute hyperthyroid decompensation documented by the provider.
Clinical signs
Clinical features may include marked agitation, fever, tachycardia, confusion, vomiting, or other signs of acute systemic illness. Clinical features vary; refer to documentation.
When to use this code
Use E05.81 when the record states other thyrotoxicosis and clearly documents thyroid storm or thyrotoxic crisis. It applies when the underlying thyrotoxicosis is not coded to a more specific category. If the provider only documents hyperthyroidism without crisis, do not assign this code.
Do not use for
Do not use this code for uncomplicated thyrotoxicosis or for thyroid storm without documentation of an “other” thyrotoxicosis cause. Check documentation if the condition is described differently or if the underlying disorder is more specific.
Coding tip
Verify both elements in the note: the thyrotoxicosis type and the crisis or storm, because missing either detail can lead to a different code.