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Official Description

Sodium; other source

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 84302 refers to the measurement of sodium levels from a sample other than urine, blood, plasma, or serum. Sodium is a crucial positively charged electrolyte that plays a vital role in various physiological functions within the body. It works in conjunction with other electrolytes, including potassium, chloride, and carbon dioxide (CO2), to help regulate fluid balance and maintain proper acid-base equilibrium. This mineral is essential for normal metabolic processes, fluid levels, and vascular pressure. The measurement of sodium levels is important for screening and monitoring conditions such as hypernatremia, which is characterized by elevated blood sodium levels, and hyponatremia, which indicates low blood sodium levels. Additionally, sodium levels may be assessed to identify electrolyte imbalances that can occur due to various factors, including the use of certain medications like diuretics, which can disrupt normal electrolyte balance. The sodium measurement is typically performed using ion-selective electrode (ISE) methodology, a precise technique that allows for accurate determination of sodium concentration in the specified sample type.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The measurement of sodium levels using CPT® Code 84302 is indicated for various clinical scenarios, particularly when assessing electrolyte balance and metabolic health. The following conditions may warrant this procedure:

  • Hypernatremia - This condition is characterized by elevated sodium levels in the blood, which can lead to serious health complications if not monitored and managed appropriately.
  • Hyponatremia - This refers to low sodium levels in the blood, which can result in neurological symptoms and other health issues, necessitating careful monitoring.
  • Electrolyte Imbalances - Patients presenting with symptoms of electrolyte disturbances may require sodium level assessment to determine the underlying cause and guide treatment.
  • Medication Monitoring - Sodium levels may be monitored in patients taking certain medications, such as diuretics, which can affect electrolyte balance and lead to either hypernatremia or hyponatremia.

2. Procedure

The procedure for measuring sodium levels using CPT® Code 84302 involves several key steps to ensure accurate results. The following procedural steps are outlined:

  • Sample Collection - A sample other than urine, blood, plasma, or serum is obtained for sodium measurement. This may include samples from other bodily fluids or tissues, depending on the clinical context and the specific requirements of the test.
  • Preparation of the Sample - The collected sample is prepared according to laboratory protocols to ensure that it is suitable for analysis. This may involve processing the sample to remove any contaminants or interferences that could affect the sodium measurement.
  • Measurement Using ISE Methodology - The sodium concentration in the prepared sample is measured using ion-selective electrode (ISE) methodology. This technique allows for precise quantification of sodium levels, providing reliable data for clinical decision-making.
  • Result Interpretation - Once the measurement is complete, the results are interpreted in the context of the patient's clinical condition. This interpretation is crucial for determining the appropriate management and treatment strategies based on the sodium levels obtained.

3. Post-Procedure

After the sodium level measurement using CPT® Code 84302, the following post-procedure considerations should be noted. The results should be communicated to the healthcare provider promptly to facilitate timely clinical decision-making. If abnormal sodium levels are detected, further evaluation and management may be necessary, which could include additional testing or adjustments to the patient's treatment plan. It is also important to monitor the patient for any symptoms related to sodium imbalances, as these may require immediate intervention. Documentation of the procedure and results should be completed in accordance with standard laboratory practices to ensure compliance and facilitate future reference.

Short Descr ASSAY OF SWEAT SODIUM
Medium Descr ASSAY OF SODIUM OTHER SOURCE
Long Descr Sodium; other source
Status Code Statutory Exclusion (from MPFS, may be paid under other methodologies)
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 9 - Not Applicable
Multiple Procedures (51) 9 - Concept does not apply.
Bilateral Surgery (50) 9 - Concept does not apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 9 - Concept does not apply.
Co-Surgeons (62) 9 - Concept does not apply.
Team Surgery (66) 9 - Concept does not apply.
Diagnostic Imaging Family 99 - Concept Does Not Apply
CLIA Waived (QW) No
APC Status Indicator Conditionally packaged laboratory tests
Type of Service (TOS) 5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS) T1H - Lab tests - other (non-Medicare fee schedule)
MUE 1
CCS Clinical Classification 233 - Laboratory - Chemistry and Hematology
90 Reference (outside) laboratory: when laboratory procedures are performed by a party other than the treating or reporting physician or other qualified health care professional, the procedure may be identified by adding modifier 90 to the usual procedure number.
Q4 Service for ordering/referring physician qualifies as a service exemption
Date
Action
Notes
2013-01-01 Changed Medium Descriptor changed.
2003-01-01 Added First appearance in code book in 2003.
Code
Description
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