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Home/Diagnosis/ICD-10 Coding for Free T4 Test

ICD-10 Coding for Free T4 Test

E05.90
E03.9

Complete ICD-10-CM coding and documentation guide for icd-10 coding for free t4 test includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Thyroxine Test
FT4 Test
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Key Information: ICD-10 Coding for Free T4 Test

Essential facts and insights about ICD-10 Coding for Free T4 Test

Use ICD-10 code E05.90 for thyrotoxicosis, unspecified without thyrotoxic crisis or storm, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Thyrotoxicosis, unspecified without thyrotoxic crisis or storm

Billable Code
E05.90
Billable

Diagnostic Criteria

clinical_criteria:
  • • Elevated Free T4 and suppressed TSH with symptoms of hyperthyroidism.

Applicable To

  • • Hyperthyroidism

Important Notes

  • • Ensure lab results are documented to support the diagnosis.

Hypothyroidism, unspecified

Billable Code
E03.9
Billable

Diagnostic Criteria

clinical_criteria:
  • • Free T4 <0.8 ng/dL
  • • TSH >4.5 µIU/mL
  • • Symptoms such as fatigue, cold intolerance

Applicable To

  • • Hypothyroidism

Important Notes

  • • Document symptoms and lab results to support the diagnosis.
Ancillary Codes

Additional codes that may be used with this diagnosis

R94.6

Abnormal results of thyroid function studies

Use for abnormal thyroid function tests when specific thyroid disorder is not yet diagnosed.

Frequently Asked Questions

What is the ICD-10 code for Free T4 test?

The ICD-10 code for conditions assessed by Free T4 levels includes E05.90 for hyperthyroidism and E03.9 for hypothyroidism.

How is Free T4 used in thyroid diagnosis?

Free T4 levels help diagnose thyroid dysfunction, with high levels indicating hyperthyroidism and low levels indicating hypothyroidism.

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