Endocrine System (BG) ICD-10-PCS
The BG body system covers Imaging procedures on endocrine system, with 76 ICD-10-PCS codes across 3 root operations, 70 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 3 operations · 76 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| BG2 | Computerized Tomography (CT Scan)Computer reformatted digital display of multiplanarimages developed from the capture of multiple exposures of external ionizing radiation | 44 | 42 |
| BG3 | Magnetic Resonance Imaging (MRI)Computer reformatted digital display of multiplanar imagesdeveloped from the capture of radiofrequency signals emitted by nuclei in a body site excitedwithin a magnetic field | 20 | 18 |
| BG4 | UltrasonographyReal time display of images of anatomy or flow information developed from thecapture of reflected and attenuated high frequency sound waves | 12 | 10 |
The info icon shows the official root operation definition and previews the codes in that range.
About the BG Body System
The ICD-10-PCS root operation BG refers to Imaging of the Endocrine System, involving diagnostic procedures that create visual representations of endocrine organs without direct contact or alteration. This operation focuses on capturing detailed internal images to support diagnosis and treatment planning.
Within the Imaging classification, several modalities are highlighted for endocrine assessment. For example, Computerized Tomography (CT Scan) (BG2) uses multiple exposures of external ionizing radiation to produce reformatted, multiplanar digital images. Magnetic Resonance Imaging (MRI) (BG3) captures radiofrequency signals emitted by nuclei in the magnetic field to generate detailed images of endocrine tissue in multiple planes. Ultrasonography (BG4) employs high-frequency sound waves to provide real-time visualization of anatomy or blood flow, valuable for evaluating endocrine glands. These specific endocrine system imaging codes enable precise documentation of non-invasive diagnostic imaging that aids clinical decision-making.
Questions About This Page
How many codes are in the BG body system?
The BG body system contains 76 ICD-10-PCS codes in FY 2026, organized into 3 root operations. 70 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.
