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Official Description

Fatty acids, nonesterified

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 82725 refers to the measurement of nonesterified fatty acids, commonly known as free fatty acids, in a blood sample. This blood test is crucial for assessing the levels of fatty acids that are not bound to other molecules, providing insight into the body's lipid metabolism. Fatty acids can exist in two forms: free, which circulate in the bloodstream, and esterified, which are bound to other substances. After dietary fat intake, the digestive system breaks down fat molecules into smaller components. Short and medium-chain fatty acids are absorbed directly into the bloodstream through the intestinal capillaries, while larger long-chain fatty acids are encapsulated by lipoproteins, forming chylomicrons. These chylomicrons enter the lymphatic system to avoid the liver initially and are eventually deposited into the bloodstream at the left subclavian vein. For this test, a fasting blood sample is required, which is obtained through a venipuncture procedure. The serum from the blood sample is then analyzed using quantitative spectrophotometry, a method that measures the concentration of substances in a solution based on light absorption. This test is essential for evaluating metabolic conditions and understanding lipid profiles in patients.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The CPT® Code 82725 is indicated for the assessment of nonesterified fatty acid levels in various clinical scenarios. The following conditions may warrant this test:

  • Metabolic Disorders Evaluation of patients suspected of having metabolic disorders that affect lipid metabolism.
  • Diabetes Management Monitoring of free fatty acid levels in patients with diabetes, as alterations in fatty acid levels can impact insulin sensitivity.
  • Obesity Assessment Assessment of free fatty acids in obese patients to understand their metabolic status and risk for associated complications.
  • Cardiovascular Risk Evaluation Evaluation of cardiovascular risk factors, as elevated free fatty acids may be associated with increased risk of heart disease.

2. Procedure

The procedure for obtaining a blood sample for CPT® Code 82725 involves several key steps to ensure accurate measurement of nonesterified fatty acids:

  • Step 1: Patient Preparation The patient must be instructed to fast for a specified period prior to the blood draw. Fasting is essential to obtain baseline levels of free fatty acids without interference from recent food intake.
  • Step 2: Venipuncture A trained healthcare professional performs a venipuncture to collect a blood sample. This involves using a sterile needle to puncture a vein, typically in the arm, and drawing the required volume of blood into a collection tube.
  • Step 3: Serum Separation After collection, the blood sample is allowed to clot, and then it is centrifuged to separate the serum from the cellular components. The serum is the liquid portion that contains the nonesterified fatty acids.
  • Step 4: Quantitative Spectrophotometry The serum is then subjected to quantitative spectrophotometry, a laboratory technique that measures the concentration of free fatty acids based on their light absorption characteristics. This analysis provides the quantitative results needed for clinical interpretation.

3. Post-Procedure

After the blood sample has been collected and processed, there are generally no specific post-procedure care requirements for the patient. However, patients may be advised to resume normal activities immediately following the venipuncture. It is important to monitor the site of the blood draw for any signs of complications, such as excessive bleeding or infection. The results of the test will be interpreted by the healthcare provider, who will discuss the findings with the patient and determine any necessary follow-up actions based on the levels of nonesterified fatty acids measured.

Short Descr ASSAY OF BLOOD FATTY ACIDS
Medium Descr FATTY ACIDS NONESTERIFIED
Long Descr Fatty acids, nonesterified
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.
GY Item or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit
GA Waiver of liability statement issued as required by payer policy, individual case
Date
Action
Notes
Pre-1990 Added Code added.
Code
Description
Code
Description
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