Summary & Overview
CPT 84443: Thyroid Stimulating Hormone Laboratory Test
CPT code 84443 represents the laboratory analysis of thyroid stimulating hormone (TSH), a critical test for assessing thyroid function in patients. This procedure is widely utilized across the United States to diagnose and monitor thyroid disorders, including hypothyroidism and hyperthyroidism. The test is performed in clinical laboratories, most commonly in outpatient settings, and is a standard component of endocrine and primary care evaluations.
Major national payers such as Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare provide coverage for TSH testing, reflecting its importance in routine and specialized medical care. Readers will gain insight into the clinical context of TSH testing, relevant billing and coding practices, and associated policy updates. The publication also highlights common modifiers used in laboratory billing, associated provider taxonomies, and ICD-10 diagnoses frequently linked to TSH testing, such as various types of heart failure and diabetes mellitus.
This summary offers a comprehensive overview of CPT code 84443, including its clinical significance, payer coverage, and related coding considerations. Healthcare professionals, billing specialists, and policy analysts will find valuable information on benchmarks, coding updates, and the broader context of laboratory testing for thyroid function.
CPT Code Overview
CPT code 84443 is used to report the laboratory measurement of thyroid stimulating hormone (TSH) levels. This test is a key component in evaluating thyroid function and is commonly ordered to assess conditions such as hypothyroidism and hyperthyroidism. The service falls under Pathology and Laboratory Procedures – Chemistry Procedures and is typically performed in a laboratory setting, most often in an outpatient lab environment (Place of Service 81). Accurate TSH measurement is essential for guiding clinical decisions related to thyroid health.
Clinical & Coding Specifications
Clinical Context
A patient with a history of heart failure or type 2 diabetes mellitus presents to their primary care provider or cardiologist for routine follow-up. The provider orders laboratory tests to assess thyroid function, as thyroid disorders can impact cardiovascular health and metabolic control. The laboratory collects a blood sample in an outpatient setting (Place of Service 81) and performs a thyroid stimulating hormone (TSH) assay using CPT code 84443. The results are reviewed by the provider to guide further management of the patient's condition.
Coding Specifications
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Modifier
91: Used when the TSH test (84443) is repeated on the same patient to obtain multiple results, such as monitoring changes over time. -
Modifier
59: Applied when the TSH test is performed as a distinct procedural service, separate from other laboratory tests, to indicate that it is not part of a bundled service.
| Modifier Code | Description |
|---|---|
91 | Repeat Clinical Diagnostic Laboratory Test |
59 | Distinct Procedural Service |
- Provider Taxonomies:
| Taxonomy Code | Specialty |
|---|---|
291U00000X | Clinical Medical Laboratory |
207Q00000X | Family Medicine Physician |
207R00000X | Internal Medicine Physician |
Related Diagnoses
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E11.10– Type 2 diabetes mellitus without complications- TSH testing may be indicated to rule out thyroid dysfunction, which can affect glycemic control.
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E11.11– Type 2 diabetes mellitus with hypoglycemia without coma- Thyroid disorders can contribute to hypoglycemic episodes; TSH testing helps assess this possibility.
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I50.810– Acute combined systolic and diastolic heart failure- Thyroid dysfunction can exacerbate heart failure; TSH testing is relevant for evaluation.
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I50.811– Chronic combined systolic and diastolic heart failure- Monitoring thyroid status is important in chronic heart failure management.
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I50.812– Acute on chronic combined systolic and diastolic heart failure- TSH testing assists in identifying contributing factors to acute decompensation.
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I50.813– Right heart failure- Thyroid abnormalities may influence right heart function; TSH testing is clinically relevant.
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I50.814– Left heart failure- TSH testing is used to evaluate potential thyroid-related causes or contributors.
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I50.82– Unspecified heart failure- TSH testing helps clarify underlying etiologies in heart failure of unknown cause.
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I50.83– High output heart failure- Hyperthyroidism can cause high output heart failure; TSH testing is essential.
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I50.84– End stage heart failure- Thyroid status assessment is part of comprehensive care in end stage heart failure.
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I50.89– Other heart failure- TSH testing is used to evaluate thyroid function in less common heart failure presentations.
Related CPT Codes
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80053– Comprehensive metabolic panel- Often ordered alongside
84443to evaluate overall metabolic status, including kidney and liver function, electrolytes, and glucose, which are relevant in patients with diabetes or heart failure.
- Often ordered alongside
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85025– Hemogram; automated and automated differential WBC count (CBC with diff)- Commonly performed with
84443to assess hematologic status, detect anemia, infection, or other blood disorders that may impact or be impacted by thyroid function.
- Commonly performed with
These codes are frequently used together in routine laboratory panels for patients with chronic conditions such as diabetes and heart failure. They complement the TSH assay by providing a broader clinical picture.
National Reimbursement Benchmarks
For CPT code 84443, the national mean rate for BUCA (average commercial) is $17.59, which is higher than the UnitedHealth Group mean rate of $14.62 and the Blue Cross Blue Shield mean rate of $15.82. Aetna and Cigna both report higher mean rates, at $21.02 and $20.02 respectively. Medicare rates are not available in the input.
Rate dispersion, measured as the difference between the 75th and 25th percentiles, varies across payers. Blue Cross Blue Shield has the tightest range at $6.50, while Cigna and Aetna both have the widest range at $13.00. UnitedHealth Group and BUCA show moderate dispersion, at $8.00 and $8.79 respectively.
The table and chart below present the full breakdown of national benchmarks for CPT code 84443 across major payers.
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