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ICD-10 Guide
ICD-10 CodesE05.31

E05.31

Billable

Thyrotoxicosis from ectopic thyroid tissue with thyrotoxic crisis or storm

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

Code Description

ICD-10 E05.31 is a billable code used to indicate a diagnosis of thyrotoxicosis from ectopic thyroid tissue with thyrotoxic crisis or storm.

Key Diagnostic Point:

Thyrotoxicosis from ectopic thyroid tissue with thyrotoxic crisis or storm is a severe and life-threatening condition characterized by an excess of thyroid hormones in the body due to the presence of thyroid tissue located outside its normal anatomical location. This ectopic tissue can produce thyroid hormones autonomously, leading to hyperthyroidism. In a thyrotoxic crisis, also known as thyroid storm, patients may experience extreme symptoms such as fever, tachycardia, agitation, and altered mental status. This condition can be precipitated by stress, infection, or surgery and requires immediate medical intervention. Diagnosis typically involves clinical evaluation, thyroid function tests, and imaging studies to locate the ectopic tissue. Management includes antithyroid medications, beta-blockers, and supportive care, with the potential need for surgical intervention to remove the ectopic tissue.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Presence of ectopic thyroid tissue complicates diagnosis.
  • Differentiation from other forms of hyperthyroidism is necessary.
  • Management may involve multiple specialties (endocrinology, surgery).
  • Documentation must clearly indicate the presence of a thyrotoxic crisis.

Audit Risk Factors

  • Inadequate documentation of ectopic tissue.
  • Failure to document the acute nature of the thyrotoxic crisis.
  • Misclassification of hyperthyroidism type.
  • Lack of supporting lab results for diagnosis.

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Thorough documentation of thyroid function tests, imaging studies, and clinical symptoms.

Common Clinical Scenarios

Patients presenting with symptoms of hyperthyroidism and abnormal thyroid function tests.

Billing Considerations

Ensure clear documentation of the presence of ectopic tissue and any precipitating factors for the thyrotoxic crisis.

Surgery

Documentation Requirements

Detailed operative reports and pre-operative assessments.

Common Clinical Scenarios

Surgical intervention for ectopic thyroid tissue or complications from thyrotoxicosis.

Billing Considerations

Document the surgical findings and rationale for intervention clearly.

Coding Guidelines

Inclusion Criteria

Use E05.31 When
  • Follow official ICD
  • 10 coding guidelines, ensuring accurate documentation of the condition's acute nature and the presence of ectopic thyroid tissue
  • Include relevant lab results and imaging studies to support the diagnosis

Exclusion Criteria

Do NOT use E05.31 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

84443CPT Code

Thyroid function tests (T3, T4)

Clinical Scenario

Used to confirm diagnosis of thyrotoxicosis.

Documentation Requirements

Document lab results and clinical correlation.

Specialty Considerations

Endocrinologists should ensure comprehensive lab panels are ordered.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like thyrotoxicosis from ectopic thyroid tissue, improving the accuracy of diagnoses and treatment plans.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like thyrotoxicosis from ectopic thyroid tissue, improving the accuracy of diagnoses and treatment plans.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like thyrotoxicosis from ectopic thyroid tissue, improving the accuracy of diagnoses and treatment plans.

Resources

Clinical References

  • •
    American Thyroid Association Guidelines

Coding & Billing References

  • •
    American Thyroid Association Guidelines

Frequently Asked Questions

What is the difference between thyrotoxicosis and hyperthyroidism?

Thyrotoxicosis refers to the clinical syndrome resulting from elevated thyroid hormone levels, while hyperthyroidism specifically refers to the overproduction of thyroid hormones by the thyroid gland. Thyrotoxicosis can occur due to various causes, including ectopic thyroid tissue.