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ICD-10 Guide
ICD-10 CodesE06.1

E06.1

Billable

Subacute thyroiditis

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

Code Description

ICD-10 E06.1 is a billable code used to indicate a diagnosis of subacute thyroiditis.

Key Diagnostic Point:

Subacute thyroiditis is an inflammatory condition of the thyroid gland, often characterized by a painful enlargement of the thyroid. It typically follows a viral infection, such as mumps or influenza, and is more common in women than men. Patients may present with symptoms including neck pain, fever, fatigue, and dysphagia. Laboratory tests often reveal elevated thyroid hormone levels initially, followed by a phase of hypothyroidism as the inflammation resolves. The condition is usually self-limiting, with most patients recovering within a few months. Diagnosis is supported by clinical findings, thyroid function tests, and imaging studies, such as ultrasound, which may show a heterogeneous thyroid gland. Treatment primarily focuses on symptom management, including the use of non-steroidal anti-inflammatory drugs (NSAIDs) for pain relief. In some cases, corticosteroids may be prescribed to reduce inflammation. Monitoring thyroid function is essential, as some patients may develop transient or permanent hypothyroidism following the acute phase.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiation from other thyroid disorders such as Hashimoto's thyroiditis and Graves' disease.
  • Variability in symptoms and laboratory findings.
  • Potential for transient hypothyroidism complicating the diagnosis.
  • Need for thorough documentation of clinical findings and treatment response.

Audit Risk Factors

  • Inadequate documentation of clinical symptoms.
  • Failure to document the duration of symptoms.
  • Lack of follow-up thyroid function tests.
  • Misclassification of the condition as chronic or acute without proper justification.

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Detailed clinical notes on symptoms, lab results, and treatment plans.

Common Clinical Scenarios

Patients presenting with neck pain and altered thyroid function tests.

Billing Considerations

Endocrinologists should ensure comprehensive thyroid function tests are documented to support the diagnosis.

Primary Care

Documentation Requirements

Thorough history and physical examination notes, including symptom duration and severity.

Common Clinical Scenarios

Initial evaluation of patients with thyroid-related symptoms.

Billing Considerations

Primary care providers should be aware of the need for referral to specialists if symptoms persist or worsen.

Coding Guidelines

Inclusion Criteria

Use E06.1 When
  • According to ICD
  • 10 coding guidelines, E06
  • 1 should be used when the condition is specifically diagnosed as subacute thyroiditis
  • It is important to document the clinical presentation and any relevant laboratory findings to support the diagnosis

Exclusion Criteria

Do NOT use E06.1 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 suspected cases of thyroiditis.

Documentation Requirements

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

Specialty Considerations

Endocrinologists should ensure that TSH levels are monitored throughout the treatment process.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of thyroid conditions, including subacute thyroiditis, which enhances the accuracy of patient records and treatment plans.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thyroid conditions, including subacute thyroiditis, which enhances the accuracy of patient records and treatment plans.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of thyroid conditions, including subacute thyroiditis, which enhances the accuracy of patient records and treatment plans.

Resources

Clinical References

  • •
    American Thyroid Association Guidelines

Coding & Billing References

  • •
    American Thyroid Association Guidelines

Frequently Asked Questions

What are the common symptoms of subacute thyroiditis?

Common symptoms include neck pain, fever, fatigue, and changes in thyroid hormone levels, which may initially present as hyperthyroidism followed by hypothyroidism.