82465

Cholesterol, serum or whole blood, total

CPT code 82465 represents the quantitative measurement of total cholesterol in the blood, typically performed using serum or plasma. Cholesterol is a vital lipid, serving as a structural component of cell membranes and a precursor for the synthesis of steroid hormones, bile acids, and Vitamin D. However, elevated levels are a primary risk factor for the development of atherosclerosis and coronary artery disease. The procedure is usually conducted via an automated enzymatic method. In this biochemical process, cholesterol esters in the sample are first hydrolyzed by the enzyme cholesterol esterase into free cholesterol and fatty acids. Subsequently, cholesterol oxidase catalyzes the oxidation of the free cholesterol, producing hydrogen peroxide as a byproduct. This hydrogen peroxide then reacts with a chromogen in the presence of peroxidase to form a colored dye, the intensity of which is proportional to the concentration of cholesterol in the specimen. This colorimetric change is measured using a spectrophotometer at a specific wavelength. Total cholesterol levels provide a composite measure of the cholesterol contained in all lipoprotein fractions, including low-density lipoprotein (LDL), high-density lipoprotein (HDL), and very-low-density lipoprotein (VLDL). While total cholesterol is an essential metric for initial screening and general risk assessment, it is often performed as part of a more comprehensive lipid panel to differentiate between these fractions. Clinical management of patients with dyslipidemia relies heavily on the accuracy of these laboratory measurements to guide dietary interventions, lifestyle modifications, and pharmacological treatments such as statin therapy. Regular monitoring of total cholesterol is indicated for individuals with established cardiovascular disease, hypertension, or diabetes mellitus, as well as those with a strong family history of premature heart disease. It serves as a foundational biomarker in the calculation of various risk scores, such as the Framingham Risk Score or the ASCVD Risk Estimator, which help clinicians determine the appropriate intensity of lipid-lowering therapy.

Clinical Indications

  • Screening for risk of cardiovascular disease
  • Monitoring effectiveness of lipid-lowering therapy (e.g., statins)
  • Evaluation of patients with metabolic syndrome
  • Assessment of individuals with a family history of premature coronary artery disease
  • Evaluation of patients with clinical signs of hyperlipidemia such as xanthomas
  • Part of a standard wellness or routine physical examination
  • Monitoring patients with comorbid conditions like diabetes or hypertension

Procedure Steps

  1. Collection of blood via venipuncture into a serum separator tube (SST) or lithium heparin tube
  2. Ensuring the specimen is properly labeled with patient identifiers and collection time
  3. Centrifugation of the blood sample to separate the serum or plasma from cellular components
  4. Aliquotting the serum/plasma into the analyzer sample cup if necessary
  5. Introduction of the sample into an automated analyzer using enzymatic assay methodology
  6. Enzymatic hydrolysis of cholesterol esters to free cholesterol via cholesterol esterase
  7. Oxidation of free cholesterol by cholesterol oxidase, generating hydrogen peroxide
  8. Reaction of hydrogen peroxide with a chromogenic substrate to produce a measurable color change
  9. Spectrophotometric measurement of the absorbance at a specific wavelength
  10. Calculation and reporting of the total cholesterol concentration in mg/dL

Coding Guidelines

  • Code 82465 should be used for a single, quantitative total cholesterol test
  • Do not report 82465 if the test is performed as part of a lipid panel (CPT 80061)
  • If the laboratory performing the test has a CLIA Certificate of Waiver, the modifier QW must be appended (82465-QW)
  • For monitoring of patients on long-term drug therapy, ensure the appropriate ICD-10-CM code for long-term drug use is included
  • Only one unit of 82465 should be reported per date of service regardless of the number of samples taken
  • Verify whether the test is for screening or diagnostic purposes, as this impacts the choice of primary ICD-10-CM code

Associated ICD-10 Codes