Breast (DM) ICD-10-PCS
The DM body system covers Radiation Therapy procedures on breast, with 120 ICD-10-PCS codes across 4 root operations, 112 of them billable in fiscal year 2026. Each root operation defines a distinct procedural objective, and the info icons show the official definition with a preview of the codes inside.
Root Operations in This Body System 4 operations · 120 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| DM0 | Beam RadiationA type of radiation therapy that uses a machine to aim high-energy rays at the cancer from outside of the body | 34 | 32 |
| DM1 | BrachytherapyA type of radiation therapy in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into or near a tumor | 58 | 56 |
| DM2 | Stereotactic RadiosurgeryA type of external radiation therapy that uses special equipment to position the patient and precisely give a single large dose of radiation to a tumor | 14 | 12 |
| DMY | Other Radiation | 14 | 12 |
The info icon shows the official root operation definition and previews the codes in that range.
About the DM Body System
The ICD-10-PCS root operation DM pertains to radiation therapy directed at the Breast. This operation encompasses various techniques used to treat breast cancer by targeting malignant cells with radiation.
Radiation Therapy for the breast includes several approaches, each coded separately for precise documentation. Beam Radiation (DM0) refers to external high-energy rays aimed at the tumor from outside the body. Brachytherapy (DM1) involves placing radioactive materials directly into or near the tumor using needles or seeds, delivering localized radiation internally. Stereotactic Radiosurgery (DM2) is a precise external technique that administers a single, high-dose radiation treatment to the tumor using advanced positioning equipment. The code DMY captures other types of radiation therapies not otherwise specified. These breast radiation therapy codes allow for detailed recording of the therapy method used, which is crucial for treatment planning and clinical outcomes tracking.
Questions About This Page
How many codes are in the DM body system?
The DM body system contains 120 ICD-10-PCS codes in FY 2026, organized into 4 root operations. 112 of them are billable on inpatient claims.
What is a root operation?
The root operation is the third character of every ICD-10-PCS code and names the objective of the procedure. Drainage takes fluid out, Excision cuts out a portion of a body part, and Resection removes all of one. Picking the right root operation is the central skill of PCS coding, so each one above carries its official CMS definition.
Related References
Source: CMS FY 2026 ICD-10-PCS order file and code tables, effective October 1, 2025 through September 30, 2026.
