Summary & Overview
CPT 84133: Urine Potassium Measurement
CPT code 84133 denotes a laboratory assay that measures potassium concentration in a urine specimen. Urine potassium testing supports diagnosis and management of electrolyte disorders, renal tubular function evaluation, and monitoring of patients on therapies that affect potassium balance. As a routine clinical chemistry test, it is widely performed in clinical and hospital laboratories and is relevant for inpatient and outpatient care.
Key national payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose of the test, typical sites of service, and payer coverage considerations. The publication summarizes benchmarking elements where available, highlights coding and billing context for laboratory service lines, and outlines common administrative modifiers and operational notes when submitting claims for urine potassium measurement.
This resource is intended to give clinicians, billing professionals, and policy staff a clear, national-level reference for CPT code 84133, its clinical role, and the types of information payers typically consider when evaluating claims. Data not available in the input are noted where applicable.
Billing Code Overview
CPT code 84133 describes a laboratory test performed by a lab analyst to evaluate the level of potassium in a patient urine specimen. This is a clinical chemistry service used to assess urinary potassium concentration for diagnostic or monitoring purposes.
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Service type: Clinical laboratory test (urine potassium measurement)
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Typical site of service: Clinical laboratory or hospital laboratory; specimen collected in an outpatient clinic, hospital, or ambulatory collection site
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Clinical & Coding Specifications
Clinical Context
A 56-year-old male with hypertension and chronic kidney disease presents to the outpatient laboratory for routine monitoring. The clinician orders a spot urine potassium measurement to evaluate electrolyte excretion after a recent change in antihypertensive therapy and to assess renal tubular handling of potassium. The patient provides a midstream urine specimen at the clinic collection area. A lab assistant or phlebotomist registers the specimen, labels it with patient identifiers and collection time, and transports it to the clinical laboratory. A certified medical laboratory scientist prepares the specimen and performs the quantitative urine potassium assay using an automated chemistry analyzer. Results are reviewed by the laboratory information system, verified by the lab analyst, and reported electronically to the ordering provider. If abnormal (hypokaluria or hyperkaluria), results may prompt adjustment of medications, dietary counseling, or additional diagnostics such as serum electrolyte testing or 24-hour urine collection.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier required / default | Not typically appended; use per payer guidance when no other modifier applies |
11 | Professional component |