ICD-10 Coding for Free T4 Test(E05.90, E03.9)
Complete ICD-10-CM coding and documentation guide for Free T4 Test. Includes clinical validation requirements, documentation requirements, and coding pitfalls.
Also known as:
Related ICD-10 Code Ranges
Complete code families applicable to Free T4 Test
E00-E07Primary Range
Disorders of thyroid gland
This range includes conditions related to thyroid dysfunction, which are directly assessed by Free T4 levels.
Code Comparison: When to Use Each Code
Compare key differences between these codes to ensure accurate selection
| Code | Description | When to Use | Key Documentation |
|---|---|---|---|
| E05.90 | Thyrotoxicosis, unspecified without thyrotoxic crisis or storm | Use when Free T4 is elevated and TSH is suppressed, indicating hyperthyroidism. |
|
| E03.9 | Hypothyroidism, unspecified | Use when Free T4 is low and TSH is elevated, indicating hypothyroidism. |
|
Clinical Decision Support
Always review the patient's clinical documentation thoroughly. When in doubt, choose the more specific code and ensure documentation supports it.
Key Information: ICD-10 code for Free T4 test
Essential facts and insights about Free T4 Test
Primary ICD-10-CM Codes for free t4
Decision Criteria
clinical Criteria
- Elevated Free T4 and suppressed TSH with symptoms of hyperthyroidism.
Applicable To
- Hyperthyroidism
Excludes
- Thyrotoxic crisis or storm (E05.01)
Clinical Validation Requirements
- Free T4 >1.8 ng/dL
- TSH <0.4 µIU/mL
- Symptoms such as tachycardia, weight loss
Code-Specific Risks
- Incorrectly coding without supporting lab values can lead to denials.
Coding Notes
- Ensure lab results are documented to support the diagnosis.
E03.9 - Hypothyroidism, unspecified
Use when Free T4 is low and TSH is elevated, indicating hypothyroidism.
Applicable To
- Hypothyroidism
Excludes
- Postprocedural hypothyroidism (E89.0)
Clinical Validation Requirements
- Free T4 <0.8 ng/dL
- TSH >4.5 µIU/mL
- Symptoms such as fatigue, cold intolerance
Coding Notes
Document symptoms and lab results to support the diagnosis.
Ancillary Codes
Additional codes that should be used in conjunction with the main diagnosis codes when applicable.
Abnormal results of thyroid function studies
R94.6Differential Codes
Alternative codes to consider when ruling out similar conditions to the primary diagnosis.
Documentation & Coding Risks
Avoid these common documentation and coding issues when documenting Free T4 Test to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code E05.90.
Impact
Clinical: May lead to misdiagnosis., Regulatory: Non-compliance with documentation standards., Financial: Potential claim denials.
Mitigation Strategy
Document specific lab values and symptoms., Use structured templates for consistency.
Impact
Reimbursement: Claims may be denied due to lack of supporting documentation., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate clinical data representation.
Mitigation Strategy
Ensure TSH >4.5 µIU/mL is documented.
Impact
Inadequate documentation of lab results and clinical correlation.
Mitigation Strategy
Ensure comprehensive documentation of lab values and symptoms.
Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.
Frequently Asked Questions
Common questions about ICD-10 coding for Free T4 Test, with expert answers to help guide accurate code selection and documentation.
Documentation Templates for Free T4 Test
Use these documentation templates to ensure complete and accurate documentation for Free T4 Test. These templates include all required elements for proper coding and billing.
Thyroid Dysfunction Evaluation
Specialty: EndocrinologyRequired Elements
- Patient symptoms
- Lab results
- Clinical assessment
- Treatment plan
Example Documentation
Examples: Poor vs. Good Documentation
Poor Documentation Example
Good Documentation Example
Explanation
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