G0279 - 3D mammography imaging (breast tomosynthesis)

Healthcare Common Procedure Coding System

Last updated: 10/30/2025

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 diagnostic digital breast tomosynthesis, which is a specialized type of 3D mammography. It creates detailed, layered images of breast tissue that can be viewed slice by slice, similar to a CT scan but specifically for breast imaging. This procedure can be performed on one breast (unilateral) or both breasts (bilateral) and is used in addition to standard mammography to get clearer, more detailed images of breast tissue. The 3D imaging helps radiologists see through overlapping tissue layers that might obscure abnormalities in traditional 2D mammograms.

Additional Information

This is an add-on code that must be billed with a primary mammography code. The tomosynthesis provides enhanced imaging that can reduce the need for follow-up imaging due to overlapping tissue. This technology is particularly helpful for patients with dense breast tissue.

Category

Diagnostic Imaging

Medical Specialty

Radiology/Breast Imaging

Expected Costs

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

What's Required Before This

  • Standard mammography procedure (codes 77065 or 77066)
  • Physician order or referral

What to Expect After

  • Results review with ordering physician
  • Potential additional imaging if abnormalities detected
  • Follow routine breast screening schedule as recommended

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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