Endocrine System (BG) ICD-10-PCS
The BG body system covers Imaging procedures on endocrine system, with 38 ICD-10-PCS codes across 3 root operations, 35 of them billable in fiscal year 2027. 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 · 38 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 | 22 | 21 |
| 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 | 10 | 9 |
| BG4 | UltrasonographyReal time display of images of anatomy or flow information developed from thecapture of reflected and attenuated high frequency sound waves | 6 | 5 |
The info icon shows the official root operation definition and previews the codes in that range.
About the BG Body System
These imaging procedures make pictures of the thyroid gland, parathyroid glands, or adrenal glands. The fourth character identifies the gland and, for an adrenal gland, distinguishes right, left, or both.
The tables separate CT, which builds images from radiation exposures; MRI, which uses signals produced in a magnetic field; and ultrasonography, which displays images from reflected sound waves. CT procedures include imaging with and without contrast.
Questions About This Page
How many codes are in the BG body system?
The BG body system contains 38 ICD-10-PCS codes in FY 2027, organized into 3 root operations. 35 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 2027 ICD-10-PCS order file and code tables, effective October 1, 2026 through September 30, 2027.
