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ICD-10 Guide
ICD-10 CodesE03.4

E03.4

Billable

Atrophy of thyroid (acquired)

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 E03.4 is a billable code used to indicate a diagnosis of atrophy of thyroid (acquired).

Key Diagnostic Point:

Atrophy of the thyroid gland refers to a reduction in the size and function of the thyroid tissue, which can occur due to various acquired factors. This condition may arise from chronic autoimmune diseases, such as Hashimoto's thyroiditis, where the immune system attacks the thyroid gland, leading to inflammation and eventual atrophy. Iodine deficiency is another significant cause, as iodine is essential for the synthesis of thyroid hormones. When the body lacks sufficient iodine, the thyroid may shrink in size due to decreased hormone production. Additionally, prolonged exposure to certain medications or radiation therapy can lead to thyroid atrophy. Clinically, patients may present with symptoms of hypothyroidism, including fatigue, weight gain, and cold intolerance, as the atrophied gland fails to produce adequate thyroid hormones. Diagnosis typically involves thyroid function tests, including serum TSH, T3, and T4 levels, which help assess the gland's functional status. Imaging studies, such as ultrasound, may also be utilized to evaluate the size and structure of the thyroid gland.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acquired and congenital causes of thyroid atrophy
  • Understanding the relationship between iodine deficiency and thyroid function
  • Interpreting thyroid function tests accurately
  • Identifying coexisting conditions that may affect thyroid health

Audit Risk Factors

  • Inadequate documentation of the underlying cause of atrophy
  • Failure to document thyroid function test results
  • Misclassification of the condition as congenital rather than acquired
  • Lack of clarity in distinguishing between hypothyroidism and atrophy

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Detailed patient history, including symptoms, lab results, and imaging studies.

Common Clinical Scenarios

Patients presenting with fatigue, weight changes, and abnormal thyroid function tests.

Billing Considerations

Ensure comprehensive documentation of autoimmune conditions and medication history.

Primary Care

Documentation Requirements

Thorough documentation of patient symptoms, family history, and referral notes.

Common Clinical Scenarios

Routine screening for thyroid dysfunction in patients with risk factors.

Billing Considerations

Document any referrals to specialists for further evaluation.

Coding Guidelines

Inclusion Criteria

Use E03.4 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the acquired nature of the atrophy
  • Include relevant lab results and clinical findings to support the diagnosis

Exclusion Criteria

Do NOT use E03.4 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

84443CPT Code

Thyroid stimulating hormone (TSH) test

Clinical Scenario

Used to evaluate thyroid function in patients suspected of having thyroid atrophy.

Documentation Requirements

Document the reason for the test and any relevant clinical findings.

Specialty Considerations

Endocrinologists may require additional tests to assess thyroid function comprehensively.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of thyroid disorders, including acquired atrophy, which enhances the accuracy of patient records and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thyroid disorders, including acquired atrophy, which enhances the accuracy of patient records and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

Resources

Clinical References

  • •
    American Thyroid Association Guidelines

Coding & Billing References

  • •
    American Thyroid Association Guidelines

Frequently Asked Questions

What are the common causes of acquired thyroid atrophy?

Common causes include autoimmune diseases like Hashimoto's thyroiditis, iodine deficiency, and certain medications or radiation therapy that damage thyroid tissue.