Summary & Overview
CPT 84300: Urine Sodium Concentration Test
CPT code 84300 represents a laboratory assay measuring urine sodium concentration from either a random specimen or a 24-hour collection. Nationally, this test is an important component of electrolyte and fluid-balance evaluation used across inpatient and outpatient settings, informing diagnosis and management of renal, endocrine, and volume-status disorders. The code reflects a routine clinical laboratory service with broad utilization in hospitals, reference labs, and outpatient collection sites.
Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical purpose, typical sites of service, common billing modifiers (listed separately), and notes on payer coverage patterns. The publication also summarizes available benchmarks and utilization context, clarifies where data is not available in the input, and outlines clinical scenarios in which the test is commonly ordered. This resource is intended for billing professionals, laboratory managers, and policy analysts seeking a focused briefing on CPT code 84300 and its role in national laboratory testing workflows.
Billing Code Overview
CPT code 84300 describes a laboratory measurement of urine sodium concentration performed on either a random urine specimen or a 24-hour urine collection. The service is a clinical laboratory test used to quantify sodium levels in urine to assess electrolyte balance, renal handling of sodium, and to aid diagnosis and management of conditions such as hyponatremia, hypernatremia, volume disorders, and certain endocrine or renal disorders.
Service type: Clinical laboratory pathology test
Typical site of service: Clinical laboratory, hospital laboratory, or outpatient specimen collection site
Data not available in the input for related taxonomies, ICD-10 diagnoses, or related billing codes.
Clinical & Coding Specifications
Clinical Context
A 62-year-old outpatient with a history of congestive heart failure and hypertension presents for routine laboratory monitoring after adjustment of diuretic therapy. The clinician orders a urine sodium measurement to evaluate volume status and response to therapy. The patient provides either a random urine sample during the clinic visit or completes a 24-hour urine collection delivered to the clinical laboratory. The laboratory analyst performs 84300 to quantify urinary sodium concentration. Results are reported to the ordering clinician and used alongside serum electrolytes, weight, intake/output records, and medication regimen to guide ongoing management.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation component, if applicable for laboratory-professional billing arrangements. |
TC | Technical component | Use when billing only the technical component (laboratory processing and equipment). |