ICD-10-CM > E00-E89 > E00-E07 > E05 > E05.3 E05.3 Thyrotoxicosis from ectopic thyroid tissue Non-Billable/Non-Specific Codes E05.30Thyrotoxicosis from ectopic thyroid tissue without thyrotoxic crisis or stormE05.31Thyrotoxicosis from ectopic thyroid tissue with thyrotoxic crisis or storm