Other thyrotoxicosis 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 critical medical emergency requiring immediate intervention, distinct from typical thyrotoxicosis.

Apply this code when documentation clearly indicates a patient experiencing a thyrotoxic crisis or storm, in the context of other specified forms of thyrotoxicosis (e.g., toxic multinodular goiter, toxic adenoma, or other causes of hyperthyroidism not otherwise specified). Documentation should detail the severe signs and symptoms consistent with a thyroid storm, such as fever, tachycardia, altered mental status, and multi-organ dysfunction.

• Ensure documentation explicitly states "thyrotoxic crisis" or "thyroid storm" in conjunction with a diagnosis of hyperthyroidism.
• Do not use this code for uncomplicated hyperthyroidism; a separate code for the specific type of thyrotoxicosis (e.g., E05.00 for Graves' disease without crisis) would be more appropriate.
• Sequence this code as the primary diagnosis when the thyrotoxic crisis is the reason for the encounter or admission, followed by codes for any associated complications or underlying conditions.