ICD-10 Code E03.9: Hypothyroidism, unspecified
Endocrine, nutritional and metabolic diseases
ICD-10 code E03.9 identifies unspecified hypothyroidism when a specific cause is not documented.
Coding guidance
The E03 category includes congenital hypothyroidism, hypothyroidism due to medicaments and other specified forms.
Excludes iodine-deficiency related hypothyroidism (E00-E02) and postprocedural hypothyroidism (E89.0).
Autoimmune thyroiditis is classified separately under E06.3.
Documentation and specificity notes
- Specify the underlying cause when documented, such as autoimmune thyroiditis.
- Document TSH and free T4 results supporting the diagnosis.
- Supports medical necessity for ongoing thyroid monitoring.
This page provides a general summary for educational purposes and is not a substitute for the official ICD-10-CM code set, the ICD-10-CM Official Guidelines for Coding and Reporting, or payer policy. Code sets are updated annually, verify against the current official release before billing.
FAQ
ICD-10 E03.9, frequently asked questions questions
- What is ICD-10 code E03.9?
- ICD-10 code E03.9 identifies unspecified hypothyroidism when a specific cause is not documented.
- Is E03.9 a billable ICD-10 code?
- Yes. E03.9 is a billable and specific ICD-10-CM code that may be used to indicate a diagnosis for reimbursement purposes, provided documentation supports it.
- What documentation supports E03.9?
- Specify the underlying cause when documented, such as autoimmune thyroiditis. Document TSH and free T4 results supporting the diagnosis. Supports medical necessity for ongoing thyroid monitoring.
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