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ICD-10 Guide
ICD-10 CodesE05.91

E05.91

Billable

Thyrotoxicosis, unspecified with thyrotoxic crisis or storm

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

Code Description

ICD-10 E05.91 is a billable code used to indicate a diagnosis of thyrotoxicosis, unspecified with thyrotoxic crisis or storm.

Key Diagnostic Point:

Thyrotoxicosis refers to a condition resulting from excessive thyroid hormone levels in the body, leading to a hypermetabolic state. When this condition escalates into a thyrotoxic crisis or storm, it becomes a life-threatening emergency characterized by severe symptoms such as high fever, tachycardia, altered mental status, and gastrointestinal disturbances. The crisis can occur in patients with untreated hyperthyroidism or those with a history of thyroid disorders, particularly in the context of stressors like infection, surgery, or trauma. The diagnosis of thyrotoxicosis is often made through clinical evaluation and laboratory tests, including serum thyroid hormone levels (T3 and T4) and thyroid-stimulating hormone (TSH) levels. In cases of thyrotoxic crisis, immediate medical intervention is critical to stabilize the patient and prevent complications such as heart failure or arrhythmias. The unspecified nature of this code indicates that the specific etiology of the thyrotoxicosis is not documented, which can complicate treatment and management strategies.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Unspecified nature of the condition complicates diagnosis.
  • Potential for multiple underlying causes of thyrotoxicosis.
  • Requires thorough documentation of clinical symptoms and laboratory results.
  • Management may involve multiple specialties, increasing documentation complexity.

Audit Risk Factors

  • Lack of detailed clinical documentation supporting the diagnosis.
  • Inadequate recording of laboratory results related to thyroid function.
  • Failure to document the acute nature of the crisis.
  • Insufficient evidence of treatment interventions provided during the crisis.

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

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

Common Clinical Scenarios

Patients presenting with symptoms of hyperthyroidism, requiring management of thyrotoxicosis.

Billing Considerations

Endocrinologists must ensure that all relevant lab results and clinical findings are documented to support the diagnosis.

Emergency Medicine

Documentation Requirements

Immediate documentation of vital signs, clinical presentation, and interventions performed.

Common Clinical Scenarios

Patients presenting to the emergency department with signs of thyrotoxic crisis.

Billing Considerations

Emergency physicians must act quickly and document all actions taken to stabilize the patient.

Coding Guidelines

Inclusion Criteria

Use E05.91 When
  • According to ICD
  • 10 coding guidelines, E05
  • 91 should be used when the specific cause of thyrotoxicosis is not documented
  • Coders should ensure that the documentation supports the diagnosis of thyrotoxic crisis and that all relevant clinical details are included

Exclusion Criteria

Do NOT use E05.91 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

84443CPT Code

Thyroid function tests (T3, T4, TSH)

Clinical Scenario

When evaluating a patient for thyrotoxicosis.

Documentation Requirements

Document the rationale for testing and results.

Specialty Considerations

Endocrinologists should ensure comprehensive lab results are included.

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, improving the accuracy of diagnoses and treatment plans. E05.91 captures the acute nature of thyrotoxic crisis, which was less clearly defined in ICD-9.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like thyrotoxicosis, improving the accuracy of diagnoses and treatment plans. E05.91 captures the acute nature of thyrotoxic crisis, which was less clearly defined in ICD-9.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like thyrotoxicosis, improving the accuracy of diagnoses and treatment plans. E05.91 captures the acute nature of thyrotoxic crisis, which was less clearly defined in ICD-9.

Resources

Clinical References

  • •
    American Thyroid Association Guidelines

Coding & Billing References

  • •
    American Thyroid Association Guidelines

Frequently Asked Questions

What are the common causes of thyrotoxicosis?

Common causes include Graves' disease, toxic multinodular goiter, thyroiditis, and excessive intake of thyroid hormone medications.

How is a thyrotoxic crisis treated?

Treatment typically involves beta-blockers for symptom control, antithyroid medications, and supportive care to stabilize the patient.