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ICD-10 Guide
ICD-10 CodesR94.6

R94.6

Abnormal results of thyroid function studies

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 R94.6 is a billable code used to indicate a diagnosis of abnormal results of thyroid function studies.

Key Diagnostic Point:

R94.6 is used to classify abnormal results from thyroid function studies, which are critical in assessing thyroid gland performance and diagnosing thyroid disorders. Thyroid function tests typically include measurements of Thyroid Stimulating Hormone (TSH), Free T4, and Free T3 levels. Abnormal results may indicate conditions such as hypothyroidism, hyperthyroidism, thyroiditis, or thyroid neoplasms. Symptoms associated with abnormal thyroid function can vary widely, including fatigue, weight changes, temperature sensitivity, and mood disturbances. The interpretation of these tests must consider clinical context, as factors such as medications, pregnancy, and acute illness can influence results. Accurate coding requires a thorough understanding of the patient's clinical picture and the specific tests performed, as well as any relevant symptoms or signs that may accompany the abnormal findings.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in thyroid function test results based on patient demographics.
  • Influence of medications and comorbid conditions on test outcomes.
  • Need for correlation with clinical symptoms for accurate diagnosis.
  • Potential for overlapping symptoms with other endocrine disorders.

Audit Risk Factors

  • Inadequate documentation of test results and clinical correlation.
  • Failure to specify the type of thyroid function tests performed.
  • Misinterpretation of abnormal results without clinical context.
  • Coding based solely on lab results without accompanying symptoms.

Specialty Focus

Medical Specialties

Internal Medicine

Documentation Requirements

Documentation should include the specific thyroid function tests performed, results, and any relevant clinical symptoms or history.

Common Clinical Scenarios

Patients presenting with fatigue, weight changes, or mood disturbances requiring thyroid function evaluation.

Billing Considerations

Consideration of patient history, including prior thyroid disorders and family history of thyroid disease.

Emergency Medicine

Documentation Requirements

Acute care documentation must include the reason for testing, results, and any immediate interventions taken based on abnormal findings.

Common Clinical Scenarios

Patients presenting with acute symptoms suggestive of thyroid dysfunction, such as severe fatigue or altered mental status.

Billing Considerations

Rapid assessment of thyroid function may be critical in acute settings, especially in cases of suspected thyroid storm or myxedema coma.

Coding Guidelines

Inclusion Criteria

Use R94.6 When
  • Follow official ICD
  • CM coding guidelines, ensuring that the code is used in conjunction with appropriate clinical documentation that supports the diagnosis of abnormal thyroid function

Exclusion Criteria

Do NOT use R94.6 When
No specific exclusions found.

Related CPT Codes

84443CPT Code

Thyroid stimulating hormone (TSH)

Clinical Scenario

Used when evaluating thyroid function in patients with symptoms suggestive of thyroid disease.

Documentation Requirements

Document the reason for the test and any relevant clinical findings.

Specialty Considerations

Endocrinologists may require more detailed documentation regarding the patient's thyroid history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of thyroid function abnormalities, improving the granularity of data for research and clinical management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thyroid function abnormalities, improving the granularity of data for research and clinical management.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of thyroid function abnormalities, improving the granularity of data for research and clinical management.

Resources

Clinical References

  • •
    American Thyroid Association Guidelines

Coding & Billing References

  • •
    American Thyroid Association Guidelines

Frequently Asked Questions

What are the common symptoms associated with abnormal thyroid function tests?

Common symptoms include fatigue, weight changes, temperature sensitivity, mood disturbances, and changes in heart rate. These symptoms can vary significantly depending on whether the patient is experiencing hypothyroidism or hyperthyroidism.