Summary & Overview
CPT 84591: Vitamin Level Assay, Laboratory Technical Service
CPT code 84591 represents a laboratory technical service for measuring vitamin levels, commonly used in clinical evaluation of suspected vitamin deficiency. Nationally, vitamin assays are important for diagnosing and monitoring conditions such as nutritional deficiencies, malabsorption, and follow-up of supplementation therapy. Accurate billing and coding of these tests affect laboratory reimbursement, clinical documentation, and quality measurement.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for vitamin level testing, what CPT code 84591 captures (the technical component of the laboratory analysis), and typical sites of service. The publication outlines common billing considerations, comparative payer coverage themes, and where to find policy and reimbursement guidance. It also highlights benchmarking points and operational implications for laboratories and billing teams.
Data not available in the input is identified where relevant; the summary focuses on national-level implications and the clinical and billing roles of CPT code 84591.
Billing Code Overview
CPT code 84591 describes a laboratory technical service that measures vitamin levels, typically ordered to evaluate suspected vitamin deficiency. The service reflects the analytic work performed by a laboratory analyst to process specimens and generate quantitative vitamin test results.
-
Service type: Clinical laboratory testing (technical component)
-
Typical site of service: Clinical laboratory or hospital laboratory
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 54-year-old patient presents to an outpatient primary care clinic with fatigue, pallor, and paresthesias. The clinician documents concern for possible vitamin B12 deficiency after history and physical exam and orders laboratory testing to quantify serum vitamin B12 levels. A phlebotomy technician collects a blood sample in the clinic; the specimen is sent to the clinical laboratory. In the lab, a medical laboratory technologist or clinical chemist performs the technical analysis using an immunoassay or mass spectrometry platform to measure vitamin concentration. Results are verified by the lab analyst and reported to the ordering provider through the electronic health record. Typical sites of service include hospital outpatient laboratories, independent clinical laboratories, and ambulatory clinic-based labs. Billing uses the laboratory technical component and, when applicable, may be accompanied by a professional component billed separately if the interpreting pathologist provides expert interpretation of specialized assays.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the professional component (interpretation) separate from the technical testing when an interpreting provider bills separately. |
TC |