What is the ICD-10 code for subclinical hypothyroidism?

The ICD-10 code for subclinical hypothyroidism due to iodine deficiency is E02. For unspecified causes, use E03.9.

When should E02 be used for hypothyroidism?

Use E02 when subclinical hypothyroidism is confirmed to be due to iodine deficiency, with documented TSH and T4 levels.

ICD-10 Coding for Subclinical Hypothyroidism(E02, E03.9, Z13.29)

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Learn about ICD-10 coding for subclinical hypothyroidism, including when to use E02 for iodine deficiency and E03.9 for unspecified causes.

Also known as:

Mild HypothyroidismEarly Hypothyroidism

Related ICD-10 Code Ranges

Complete code families applicable to Subclinical Hypothyroidism

E00-E89Primary Range

Endocrine, nutritional and metabolic diseases

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Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
E02	Subclinical iodine-deficiency hypothyroidism	Use this code when subclinical hypothyroidism is confirmed to be due to iodine deficiency.	TSH levels between 4.5 and 10 mIU/L Normal free T4 levels Documented iodine deficiency
E03.9	Hypothyroidism, unspecified	Use when the cause of hypothyroidism is not specified or known.	TSH levels above normal range Normal or low free T4 levels

Primary ICD-10-CM Codes

Subclinical iodine-deficiency hypothyroidism

E02Billable

Hypothyroidism, unspecified

E03.9Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Hypothyroidism, unspecifiedE03.9

Subclinical iodine-deficiency hypothyroidismE02

Documentation & Coding Risks

Avoid these common issues when documenting Subclinical Hypothyroidism.

Failing to document iodine deficiency

Impact

Clinical: May lead to inappropriate treatment decisions., Regulatory: Non-compliance with coding standards., Financial: Potential claim denials.

Mitigation

Ensure lab results are reviewed and documented., Educate providers on documentation requirements.

Using E02 without documented iodine deficiency

Impact

Reimbursement: Incorrect coding may lead to denied claims., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate clinical data representation.

Mitigation

Ensure documentation explicitly states iodine deficiency.

Documentation of iodine deficiency

Impact

Failure to document iodine deficiency when coding E02.

Mitigation

Implement regular documentation audits.

Frequently Asked Questions

Primary Code

E02

Subclinical iodine-deficiency hypothyroidism

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