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ICD-10 Guide
ICD-10 CodesE03.9

E03.9

Billable

Hypothyroidism, unspecified

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

Code Description

ICD-10 E03.9 is a billable code used to indicate a diagnosis of hypothyroidism, unspecified.

Key Diagnostic Point:

Hypothyroidism, unspecified (E03.9) refers to a condition characterized by an underactive thyroid gland that fails to produce sufficient thyroid hormones, leading to a range of metabolic disturbances. This condition can manifest with various symptoms, including fatigue, weight gain, cold intolerance, dry skin, hair loss, and depression. The etiology of hypothyroidism can be diverse, including autoimmune disorders such as Hashimoto's thyroiditis, iodine deficiency, or post-surgical changes following thyroidectomy. In some cases, the cause may remain unidentified, hence the designation 'unspecified.' Diagnosis typically involves clinical evaluation and laboratory tests measuring thyroid function, including serum levels of Thyroid Stimulating Hormone (TSH) and free thyroxine (FT4). An elevated TSH level with a low FT4 indicates primary hypothyroidism. Management often includes thyroid hormone replacement therapy, which requires careful monitoring to achieve optimal hormone levels and alleviate symptoms. Understanding the nuances of hypothyroidism is crucial for accurate coding and effective patient management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in symptoms and presentation among patients
  • Differentiation from other thyroid disorders such as hyperthyroidism
  • Need for comprehensive thyroid function tests for accurate diagnosis
  • Potential overlap with other conditions leading to similar symptoms

Audit Risk Factors

  • Inadequate documentation of symptoms and clinical findings
  • Failure to document thyroid function test results
  • Misclassification of hypothyroidism as hyperthyroidism
  • Lack of clarity regarding the etiology of the condition

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Thorough documentation of patient history, symptoms, lab results, and treatment plans is essential.

Common Clinical Scenarios

Patients presenting with fatigue, weight changes, or other symptoms prompting thyroid function tests.

Billing Considerations

Endocrinologists must ensure that all relevant lab results and patient responses to treatment are documented to support coding.

Primary Care

Documentation Requirements

Documentation should include a comprehensive review of symptoms, family history, and any relevant lab tests.

Common Clinical Scenarios

Routine screening for thyroid dysfunction in patients with risk factors such as obesity or family history.

Billing Considerations

Primary care providers should be vigilant in documenting any referrals to specialists for further evaluation.

Coding Guidelines

Inclusion Criteria

Use E03.9 When
  • According to ICD
  • 10 coding guidelines, E03
  • 9 should be used when hypothyroidism is diagnosed but the specific cause is not documented
  • Coders should ensure that the diagnosis is supported by clinical findings and laboratory results
  • It is important to differentiate between primary and secondary hypothyroidism when applicable

Exclusion Criteria

Do NOT use E03.9 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 having hypothyroidism.

Documentation Requirements

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

Specialty Considerations

Endocrinologists may require additional tests to confirm diagnosis.

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 hypothyroidism. E03.9 provides a clear designation for unspecified cases, which helps in tracking and managing patient populations effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thyroid disorders, including hypothyroidism. E03.9 provides a clear designation for unspecified cases, which helps in tracking and managing patient populations effectively.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of thyroid disorders, including hypothyroidism. E03.9 provides a clear designation for unspecified cases, which helps in tracking and managing patient populations effectively.

Resources

Clinical References

  • •
    American Thyroid Association

Coding & Billing References

  • •
    American Thyroid Association

Frequently Asked Questions

What is the difference between E03.9 and E03.0?

E03.9 is used for unspecified hypothyroidism, while E03.0 is specifically for congenital hypothyroidism, which is present at birth.