Thyrotoxicosis, unspecified with thyrotoxic crisis or storm

This code signifies a severe, life-threatening exacerbation of hyperthyroidism, characterized by an acute onset of systemic decompensation due to excessive thyroid hormone. It represents a medical emergency where the body's systems are overwhelmed by high levels of thyroid hormones, leading to multi-organ dysfunction. The underlying cause of the thyrotoxicosis is not specified.

Use this code when documentation clearly indicates a diagnosis of thyrotoxic crisis or thyroid storm, and the specific etiology of the thyrotoxicosis (e.g., Graves' disease, toxic multinodular goiter) is not identified. This typically applies to patients presenting with acute symptoms such as fever, tachycardia, altered mental status, and gastrointestinal disturbances in the context of hyperthyroidism. Documentation should explicitly state "thyroid storm," "thyrotoxic crisis," or similar terminology.

• Ensure documentation explicitly states "thyroid storm" or "thyrotoxic crisis" and that the underlying cause of thyrotoxicosis is unspecified.
• If the underlying cause of thyrotoxicosis is known (e.g., Graves' disease), a more specific code from the E05 category should be used.
• This code should be sequenced as the principal diagnosis when the thyrotoxic crisis is the primary reason for the encounter.