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ICD-10 Guide
ICD-10 CodesE05.9

E05.9

Billable

Thyrotoxicosis, unspecified

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

Code Description

ICD-10 E05.9 is a billable code used to indicate a diagnosis of thyrotoxicosis, unspecified.

Key Diagnostic Point:

Thyrotoxicosis refers to a condition resulting from excessive thyroid hormone levels in the bloodstream, leading to a hypermetabolic state. This condition can arise from various underlying causes, including hyperthyroidism, which is characterized by an overactive thyroid gland producing excess hormones. Thyrotoxicosis can also occur due to thyroiditis, excessive iodine intake, or the ingestion of thyroid hormone medications. Symptoms often include weight loss, increased appetite, anxiety, tremors, heat intolerance, and palpitations. The unspecified nature of this code indicates that the specific etiology of the thyrotoxicosis is not documented, which can complicate treatment and management. Accurate diagnosis often requires a combination of clinical evaluation, laboratory tests measuring thyroid function (such as TSH, T3, and T4 levels), and imaging studies. The management of thyrotoxicosis may involve antithyroid medications, radioactive iodine therapy, or surgery, depending on the underlying cause and severity of the condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in symptoms and presentation among patients
  • Need for comprehensive thyroid function tests to determine underlying cause
  • Potential overlap with other thyroid disorders such as hyperthyroidism and thyroiditis
  • Documentation must clearly indicate the unspecified nature of the condition

Audit Risk Factors

  • Insufficient documentation of symptoms and clinical findings
  • Failure to specify the underlying cause of thyrotoxicosis
  • Inconsistent use of related codes for thyroid disorders
  • Lack of supporting lab results for diagnosis

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Thorough documentation of thyroid function tests, patient history, and treatment plans.

Common Clinical Scenarios

Patients presenting with symptoms of hyperthyroidism, abnormal thyroid function tests, or complications from thyrotoxicosis.

Billing Considerations

Endocrinologists must ensure that the specific cause of thyrotoxicosis is documented to avoid coding errors.

Primary Care

Documentation Requirements

Detailed patient history, symptom assessment, and referral notes for endocrinology consultations.

Common Clinical Scenarios

Initial evaluation of patients with symptoms suggestive of thyroid dysfunction.

Billing Considerations

Primary care providers should document any referrals and follow-up care to support coding.

Coding Guidelines

Inclusion Criteria

Use E05.9 When
  • According to ICD
  • 10 coding guidelines, E05
  • 9 should be used when the specific cause of thyrotoxicosis is not documented
  • Coders should ensure that all relevant clinical information is captured to support the diagnosis

Exclusion Criteria

Do NOT use E05.9 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 any relevant symptoms.

Specialty Considerations

Endocrinologists may require additional tests to determine the cause of thyrotoxicosis.

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 thyrotoxicosis. This has improved the ability to track and manage thyroid-related conditions more effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thyroid disorders, including thyrotoxicosis. This has improved the ability to track and manage thyroid-related conditions more effectively.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of thyroid disorders, including thyrotoxicosis. This has improved the ability to track and manage thyroid-related conditions more effectively.

Resources

Clinical References

  • •
    American Thyroid Association
  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    American Thyroid Association
  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What is the difference between thyrotoxicosis and hyperthyroidism?

Thyrotoxicosis refers to the clinical syndrome resulting from excess thyroid hormones, while hyperthyroidism is a specific condition where the thyroid gland is overactive. Not all cases of thyrotoxicosis are due to hyperthyroidism.

When should I use E05.9 instead of a more specific code?

E05.9 should be used when the specific cause of thyrotoxicosis is not documented in the patient's medical record.