CG4 Nonimaging Nuclear Medicine Uptake - Endocrine System ICD-10-PCS
The CG4 code range contains 6 ICD-10-PCS codes for Nonimaging Nuclear Medicine Uptake procedures on the endocrine system. 5 of the codes are billable and valid for inpatient claim submission in fiscal year 2026.
Root Operation Definition
Nonimaging Nuclear Medicine Uptake: Introduction of radioactive materials into the body for measurements of organ function, from the detection of radioactive emissions.
Codes in the CG4 Range 6 codes · 5 billable
- CG4 Nuclear Medicine, Endocrine System, Nonimaging Nuclear Medicine UptakeNon-billable header
- CG421ZZ Nonimaging Nuclear Medicine Uptake of Thyroid Gland using Technetium 99m (Tc-99m)
- CG42FZZ Nonimaging Nuclear Medicine Uptake of Thyroid Gland using Iodine 123 (I-123)
- CG42GZZ Nonimaging Nuclear Medicine Uptake of Thyroid Gland using Iodine 131 (I-131)
- CG42YZZ Nonimaging Nuclear Medicine Uptake of Thyroid Gland using Other Radionuclide
- CG4YYZZ Nonimaging Nuclear Medicine Uptake of Endocrine System using Other Radionuclide
About the CG4 Code Range
The ICD-10-PCS root operation Nonimaging Nuclear Medicine Uptake (CG4) refers to the assessment of radionuclide absorption by a body part without generating images. It is used primarily within the Nuclear Medicine section to evaluate physiological function.
This procedure targets the Endocrine System, specifically assessing how tissues like the Thyroid Gland absorb radioactive substances. For instance, codes such as CG421ZZ specify uptake evaluation using Technetium 99m (Tc-99m), while CG42FZZ and CG42GZZ correspond to uptake with Iodine 123 (I-123) and Iodine 131 (I-131) respectively. Other codes, like CG42YZZ and CG4YYZZ, allow reporting uptake studies using other radionuclides for the thyroid gland or broader endocrine system. Accurate use of these nonimaging nuclear medicine uptake codes ensures documentation of functional assessments critical for diagnosis and treatment planning.
Questions About This Page
How many billable codes are in the CG4 range?
Of the 6 codes in this range, 5 are billable and valid for inpatient claim submission from October 1, 2025 through September 30, 2026. Table header codes group them but cannot be reported on claims.
What does the CG4 range classify?
The range classifies Nonimaging Nuclear Medicine Uptake procedures, introduction of radioactive materials into the body for measurements of organ function, from the detection of radioactive emissions, performed on the endocrine system. Each code adds the body part, approach, device, and qualifier in characters four through seven, and links to its own reference page.
Related References
Source: CMS FY 2026 ICD-10-PCS order file and code tables, effective October 1, 2025 through September 30, 2026.
