84300 Assay of urine sodium
Also known as: urine sodium, 24-hour sodium, urinary Na+
Quantitative assay of urine sodium concentration, reflecting sodium excretion and renal function.
In Plain Language
urine sodium level test
Clinical Context
Evaluates sodium balance and electrolyte disturbances; helps diagnose causes of hyponatremia and assess aldosterone function.
RVU Information
CPT 84300 does not have a physician work RVU assigned by CMS. Reimbursement for this code is determined by payer-specific fee schedules.
Billing & Documentation
Lab and pathology codes require an order from the treating provider with clinical indication. For molecular pathology and genetic testing, document the specific analytes tested and clinical rationale.
How This Code Compares
This code has a work RVU of 0.00, meaning it does not have a physician work component assigned by CMS. In the Pathology & Lab category, 94% of codes share this characteristic.
Specialties
Frequently Asked Questions
What is CPT code 84300?
CPT 84300 (Assay of urine sodium) is a Pathology & Lab code. Quantitative assay of urine sodium concentration, reflecting sodium excretion and renal function.
Who uses CPT code 84300?
CPT 84300 is used by Clinical Chemistry, Nephrology, Pathology. Evaluates sodium balance and electrolyte disturbances; helps diagnose causes of hyponatremia and assess aldosterone function.
When is CPT 84300 used?
Evaluates sodium balance and electrolyte disturbances; helps diagnose causes of hyponatremia and assess aldosterone function.
Track This Code in RVU Edge
Log procedures, calculate wRVUs, and benchmark against national data — all in one app.
CPT® is a registered trademark of the American Medical Association. Data sourced from CMS Physician Fee Schedule RVU26A. Descriptions, synonyms, and clinical context are original content by RVU Edge.