Summary & Overview
CPT 84597: Vitamin K Level Test
CPT code 84597 identifies a laboratory assay for measuring vitamin K levels to evaluate suspected deficiency in patients presenting with excessive bruising or bleeding. This code applies to the technical laboratory performance of the assay and is relevant to clinicians managing coagulopathy, nutritional deficiency, or anticoagulant-related concerns. Nationally, accurate coding of vitamin K testing supports appropriate diagnostic workflows and claims processing across payers.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find context on clinical indications for vitamin K measurement, common sites where the test is performed, and payer coverage considerations. The publication outlines typical billing and service-line placement for the test and highlights benchmarks and policy updates where available.
The analysis helps billing managers, laboratory directors, and clinical staff understand how CPT code 84597 fits into diagnostic care pathways, payer interactions, and administrative workflows. Data not available in the input is noted where applicable, and the coverage discussion focuses on national payer practices rather than state-specific rules.
Billing Code Overview
CPT code 84597 describes a laboratory test in which a lab analyst performs the technical component to measure vitamin K levels when clinicians suspect decreased vitamin K in patients with excessive bruising or bleeding.
Service Type: Clinical laboratory diagnostic test (vitamin K quantification)
Typical Site of Service: Medical laboratory or hospital clinical laboratory
Clinical & Coding Specifications
Clinical Context
A 58-year-old patient presents to the outpatient hematology clinic with a history of easy bruising, prolonged bleeding after minor cuts, and new onset petechiae. The clinician obtains a focused history including medication use (warfarin, antibiotics, anticonvulsants), diet changes, and liver disease risk factors. A physical exam confirms ecchymoses without obvious trauma. The clinician orders laboratory evaluation for bleeding diathesis including a vitamin K assay to evaluate for decreased vitamin K levels as a potential cause of coagulopathy. A phlebotomy technician draws a blood specimen; the specimen is processed in the clinical laboratory where the lab analyst performs the technical test to measure vitamin K concentration corresponding to CPT 84597. Results are routed to the ordering clinician for interpretation and determination of further management such as vitamin K supplementation, reversal of anticoagulation, or additional coagulation testing. Typical sites of service include hospital outpatient laboratory, independent clinical laboratory, or hospital inpatient laboratory depending on clinical setting. Typical patient scenarios include suspected vitamin K deficiency from malabsorption, cholestatic liver disease, prolonged antibiotic therapy, or anticoagulant-related bleeding evaluation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing the physician interpretation or consultation separate from the laboratory technical component, if applicable. |