Summary & Overview
HCPCS G9325: CT Studies Excluded from Dose Registry for Radiation Treatment Planning
HCPCS Level II code G9325 identifies CT studies that are excluded from radiation dose index registries for documented medical reasons, most commonly when imaging is integral to radiation treatment planning or image-guided radiation therapy delivery. Nationally, this code matters because it clarifies reporting exceptions for dose registry submissions and helps align clinical documentation with registry and payer reporting expectations.
Key payers in scope include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical intent, typical sites of service, and the payer landscape relevant to registry reporting and claims processing. The publication outlines benchmark considerations, relevant policy and registry reporting context, and clinical scenarios that commonly generate use of the code.
The report provides practical clarity on when G9325 applies, how it intersects with radiation oncology workflows, and what information payers typically expect on claims and in medical records. Data not available in the input are noted where applicable.
Billing Code Overview
HCPCS Level II code G9325 denotes CT studies not reported to a radiation dose index registry due to medical reasons (for example, CT studies performed for radiation treatment planning or image-guided radiation treatment delivery).
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Service type: CT imaging performed specifically for radiation treatment planning or for image-guided radiation treatment delivery
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Typical site of service: Radiation oncology departments or hospital outpatient imaging suites associated with radiation therapy services
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 64-year-old patient with locally advanced non-small cell lung cancer is scheduled for CT simulation to plan external beam radiation therapy. The radiation oncology team performs a dedicated CT simulation of the thorax with immobilization devices to map tumor volumes and critical structures for treatment planning and image-guided radiation treatment delivery. The CT images are acquired on the radiation oncology CT scanner and used solely for radiation treatment planning and on-board image guidance; these studies are not reported to a radiation dose index registry for medical reasons because they are performed as part of radiation therapy workflow rather than routine diagnostic imaging. The typical workflow includes patient immobilization and positioning, acquisition of CT simulation images with or without contrast per protocol, transfer of image datasets to the treatment planning system, contouring of targets and organs at risk by the radiation oncologist, and generation of a treatment plan by the dosimetrist/physicist. Image guidance during treatment may use the same CT dataset or additional on-board cone-beam CT acquisitions tied to the treatment delivery session.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing the physician interpretation separate from the technical component of a CT used in planning if applicable |