A9579 - Gadolinium-based MRI contrast agent injection (1 ml)

Healthcare Common Procedure Coding System

Last updated: 10/3/2025

What is a HCPCS Code?

HCPCS (Healthcare Common Procedure Coding System) codes are used to identify medical procedures, supplies, and services for billing purposes. These codes help standardize how healthcare services are reported and billed across different providers and insurance companies.

Detailed Description

This code represents one milliliter of a gadolinium-based contrast agent that is injected during an MRI (magnetic resonance imaging) scan. Gadolinium is a special dye that helps make certain tissues, blood vessels, or abnormal areas show up more clearly on MRI images. The 'not otherwise specified' means this covers gadolinium contrast agents that don't fall into other specific categories. This contrast material is administered through an IV line during your MRI procedure to enhance the quality and detail of the images.

Additional Information

This is a supply code for the contrast material itself, billed per milliliter used. The actual MRI procedure would be billed separately. Patients with kidney problems or certain allergies may not be candidates for gadolinium contrast.

Category

Advanced Imaging Supplies

Medical Specialty

Radiology

Expected Costs

Your actual cost will depend on your insurance coverage, provider location, and specific circumstances.

What's Required Before This

  • MRI scan order from physician
  • IV access for contrast injection
  • Kidney function assessment may be required

What to Expect After

  • Drink plenty of fluids after procedure to help flush contrast from body
  • Report any unusual symptoms to healthcare provider

Why Understanding This Code Matters

On Your Medical Bill

This code appears on your medical bills to identify the specific service, procedure, drug, or medical diagnosis you received. Understanding what it means helps you verify you're being charged correctly and know what to expect.

For Your Health

Knowing what this code represents helps you understand your treatment plan, ask better questions during appointments, and track your healthcare journey more effectively.

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