E05.3
⚠ Non-billable (Header)Thyrotoxicosis from ectopic thyroid tissue
Endocrine, nutritional and metabolic diseases (E00-E89)
⚠️ This is a category header code — not billable. Use a more specific child code below.
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • chronic thyroiditis with transient thyrotoxicosis (E06.2)
- • neonatal thyrotoxicosis (P72.1)
Child Codes (2)
Clinical Description
ICD-10-CM code E05.3 represents thyrotoxicosis from ectopic thyroid tissue. This code falls under the Endocrine, nutritional and metabolic diseases (E00-E89) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
This is a 5-character code at the 4th level of specificity. There are 2 more specific child codes under E05.3. Coders should note that E05.3 has 2 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code E05.3?
ICD-10-CM code E05.3 is "Thyrotoxicosis from ectopic thyroid tissue". It belongs to the category: Endocrine, nutritional and metabolic diseases (E00-E89).
Is E05.3 a billable ICD-10 code?
No, E05.3 is a non-billable header code. A more specific child code must be used for billing.
What codes are excluded with E05.3?
E05.3 has 2 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Related Codes in E05
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)