Thyrotxcosis from ectopic thyroid tissue w/o thyrotxc crisis

This code signifies hyperthyroidism resulting from the presence of thyroid tissue in an abnormal location (ectopic), such as the ovaries (struma ovarii) or lingual thyroid. It specifically excludes cases where the patient is experiencing a severe, life-threatening thyrotoxic crisis or storm. The ectopic tissue produces excess thyroid hormones, leading to symptoms of hyperthyroidism.

Apply this code when documentation confirms thyrotoxicosis caused by ectopic thyroid tissue, and there is no indication of a thyrotoxic crisis. This is typically supported by imaging studies identifying ectopic thyroid tissue and laboratory findings consistent with hyperthyroidism (e.g., elevated T3/T4, suppressed TSH). Use for conditions like hyperfunctioning struma ovarii or lingual thyroid causing hyperthyroidism.

• Differentiate from other causes of thyrotoxicosis (e.g., Graves' disease, toxic nodular goiter) which have distinct codes.
• Ensure documentation explicitly states the ectopic nature of the thyroid tissue as the cause of thyrotoxicosis.
• Do not use if the patient is in thyrotoxic crisis; a more specific code for crisis would be required.