Endocrine System (CG) ICD-10-PCS
The CG body system covers Nuclear Medicine procedures on endocrine system, with 44 ICD-10-PCS codes across 3 root operations, 38 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 · 44 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| CG1 | Planar Nuclear Medicine ImagingIntroduction of radioactive materials into the body for single plane display of images developed from the capture of radioactive emissions | 22 | 20 |
| CG2 | Tomographic (Tomo) Nuclear Medicine ImagingIntroduction of radioactive materials into the body for three dimensional display of images developed from the capture of radioactive emissions | 10 | 8 |
| CG4 | Nonimaging Nuclear Medicine UptakeIntroduction of radioactive materials into the body for measurements of organ function, from the detection of radioactive emissions | 12 | 10 |
The info icon shows the official root operation definition and previews the codes in that range.
About the CG Body System
The ICD-10-PCS root operation CG pertains to Nuclear Medicine procedures focused on the Endocrine System. This operation involves introducing radioactive materials into the body to assess endocrine organ function or create diagnostic images.
The CG Endocrine System codes cover different nuclear medicine techniques. For example, Planar Nuclear Medicine Imaging (code CG1) produces single-plane images by detecting radioactive emissions. Tomographic Nuclear Medicine Imaging (code CG2) generates three-dimensional images, enhancing visualization of endocrine structures. Additionally, Nonimaging Nuclear Medicine Uptake (code CG4) measures radioactive uptake to assess organ function without creating images. These specific codes allow precise documentation of nuclear medicine procedures involving the endocrine system, supporting accurate coding and clinical communication.
Questions About This Page
How many codes are in the CG body system?
The CG body system contains 44 ICD-10-PCS codes in FY 2026, organized into 3 root operations. 38 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.
