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ICD-10 Guide
ICD-10 CodesE05.8

E05.8

Billable

Other thyrotoxicosis

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

Code Description

ICD-10 E05.8 is a billable code used to indicate a diagnosis of other thyrotoxicosis.

Key Diagnostic Point:

Thyrotoxicosis refers to a condition resulting from excessive levels of thyroid hormones in the body, leading to a hypermetabolic state. While the most common cause is Graves' disease, other forms of thyrotoxicosis can arise from various etiologies, including toxic nodular goiter, thyroiditis, or excessive intake of thyroid hormone medications. Patients may present with symptoms such as weight loss, increased appetite, heat intolerance, palpitations, anxiety, and tremors. The diagnosis is typically confirmed through thyroid function tests, which measure serum levels of Thyroid Stimulating Hormone (TSH), Free T4, and Free T3. In cases of other thyrotoxicosis, TSH is usually suppressed, while Free T4 and/or Free T3 levels are elevated. Management may involve antithyroid medications, radioactive iodine therapy, or surgery, depending on the underlying cause. It is crucial to differentiate this condition from hyperthyroidism and other thyroid disorders to ensure appropriate treatment and avoid complications such as thyroid storm.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of underlying causes leading to thyrotoxicosis.
  • Need for comprehensive thyroid function tests interpretation.
  • Differentiation from other thyroid disorders like hyperthyroidism.
  • Potential for overlapping symptoms with other conditions.

Audit Risk Factors

  • Inadequate documentation of the underlying cause.
  • Failure to perform or document thyroid function tests.
  • Misclassification of hyperthyroidism versus thyrotoxicosis.
  • Lack of follow-up documentation on treatment response.

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Thorough documentation of thyroid function tests, clinical symptoms, and treatment plans.

Common Clinical Scenarios

Patients presenting with unexplained weight loss, anxiety, or palpitations.

Billing Considerations

Ensure clear documentation of the specific type of thyrotoxicosis and any relevant lab results.

Primary Care

Documentation Requirements

Detailed patient history, symptom assessment, and initial lab results.

Common Clinical Scenarios

Routine screening for thyroid disorders in patients with risk factors.

Billing Considerations

Document any referrals to specialists and follow-up care.

Coding Guidelines

Inclusion Criteria

Use E05.8 When
  • According to the ICD
  • CM coding guidelines, E05
  • 8 should be used when the specific cause of thyrotoxicosis is not classified elsewhere
  • Coders must ensure that the documentation supports the diagnosis and that all relevant lab results are included

Exclusion Criteria

Do NOT use E05.8 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

84443CPT Code

Thyroid stimulating hormone (TSH)

Clinical Scenario

Used to evaluate thyroid function in patients suspected of thyrotoxicosis.

Documentation Requirements

Document the reason for the test and the patient's symptoms.

Specialty Considerations

Endocrinologists may require more detailed lab results.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of thyrotoxicosis, enabling better tracking of patient outcomes and treatment efficacy. E05.8 provides a distinct code for cases that do not fit into more defined categories, improving the granularity of data collection.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thyrotoxicosis, enabling better tracking of patient outcomes and treatment efficacy. E05.8 provides a distinct code for cases that do not fit into more defined categories, improving the granularity of data collection.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of thyrotoxicosis, enabling better tracking of patient outcomes and treatment efficacy. E05.8 provides a distinct code for cases that do not fit into more defined categories, improving the granularity of data collection.

Resources

Clinical References

  • •
    American Thyroid Association Guidelines

Coding & Billing References

  • •
    American Thyroid Association Guidelines

Frequently Asked Questions

What is the difference between E05.8 and E05.0?

E05.8 is used for other forms of thyrotoxicosis not classified under specific conditions like Graves' disease (E05.0). It is important to document the specific etiology to ensure accurate coding.