Summary & Overview
CPT 83970: Parathyroid Hormone (PTH) Blood Test
CPT code 83970 denotes a laboratory assay for parathyroid hormone (PTH) and is used to evaluate parathyroid gland function and calcium homeostasis. Nationally, this test is important for detecting disorders such as primary and secondary hyperparathyroidism, hypoparathyroidism, and monitoring in patients with renal disease or calcium abnormalities. Its clinical role drives frequent use across outpatient and hospital laboratory settings.
Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, common sites of service, and payer coverage patterns. The publication summarizes benchmark reimbursement and utilization context where available, highlights relevant policy or coverage trends that affect access to PTH testing, and outlines administrative considerations for billing and claims adjudication.
The content is structured to inform laboratory managers, revenue cycle professionals, and clinicians about the purpose of the test, typical care settings, and the payment environment they are likely to encounter when billing CPT code 83970. Data not available in the input are noted where appropriate.
Billing Code Overview
CPT code 83970 is a laboratory test that measures parathyroid hormone (PTH) levels in the blood. The test is used to evaluate parathyroid gland function and to help ascertain calcium metabolism status, including investigation of abnormal calcium levels.
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Service type: Clinical laboratory testing of serum or plasma PTH concentration
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Typical site of service: Outpatient laboratory, hospital laboratory, or other clinical laboratory settings where blood specimens are collected and analyzed
Clinical & Coding Specifications
Clinical Context
A 58-year-old outpatient presents to the endocrinology clinic with fatigue, muscle weakness, and recurrent kidney stones. Laboratory evaluation is ordered to assess calcium metabolism. A serum parathyroid hormone (PTH) test is requested to measure circulating PTH levels to evaluate for primary hyperparathyroidism, secondary hyperparathyroidism (for example in chronic kidney disease), or hypoparathyroidism. Phlebotomy is performed in the clinic or an outpatient laboratory; the sample is labeled and sent to the clinical laboratory for immunoassay measurement. Results are reviewed by the ordering clinician and correlated with serum calcium, 25-hydroxyvitamin D, creatinine, and albumin to determine parathyroid function and guide management, which may include imaging, surgical referral, medication adjustment, or further metabolic workup.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the physician interpretation of the laboratory result if split billing applies (rare for lab tests but applicable when professional interpretation is separately reported). |
59 | Distinct procedural service | Use to indicate a distinct service when PTH testing is billed on the same date as another unrelated procedure when bundling edits might apply. |