CT6 Nonimaging Nuclear Medicine Assay - Urinary System ICD-10-PCS
The CT6 code range contains 7 ICD-10-PCS codes for Nonimaging Nuclear Medicine Assay procedures on the urinary system. 6 of the codes are billable and valid for inpatient claim submission in fiscal year 2026.
Root Operation Definition
Nonimaging Nuclear Medicine Assay: Introduction of radioactive materials into the body for the study of body fluids and blood elements, by the detection of radioactive emissions.
Codes in the CT6 Range 7 codes · 6 billable
- CT6 Nuclear Medicine, Urinary System, Nonimaging Nuclear Medicine AssayNon-billable header
- CT631ZZ Nonimaging Nuclear Medicine Assay of Kidneys, Ureters and Bladder using Technetium 99m (Tc-99m)
- CT63FZZ Nonimaging Nuclear Medicine Assay of Kidneys, Ureters and Bladder using Iodine 123 (I-123)
- CT63GZZ Nonimaging Nuclear Medicine Assay of Kidneys, Ureters and Bladder using Iodine 131 (I-131)
- CT63HZZ Nonimaging Nuclear Medicine Assay of Kidneys, Ureters and Bladder using Iodine 125 (I-125)
- CT63YZZ Nonimaging Nuclear Medicine Assay of Kidneys, Ureters and Bladder using Other Radionuclide
- CT6YYZZ Nonimaging Nuclear Medicine Assay of Urinary System using Other Radionuclide
About the CT6 Code Range
The ICD-10-PCS root operation Nonimaging Nuclear Medicine Assay (CT6) refers to diagnostic tests that assess physiological function of a body system using radionuclides without producing images. In the Nuclear Medicine section, this operation focuses on evaluating organ function chemically rather than visually.
For the Urinary System, codes like CT631ZZ describe assays using Technetium 99m (Tc-99m) to analyze the Kidneys, Ureters, and Bladder. Other radionuclides such as Iodine 123 (CT63FZZ), Iodine 131 (CT63GZZ), and Iodine 125 (CT63HZZ) are also utilized in testing organ function without imaging. The flexibility to code tests with various radionuclides, including other unspecified agents (CT63YZZ and CT6YYZZ), ensures precise documentation of the diagnostic assay performed. These nonimaging nuclear medicine assay codes enable clear communication of functional diagnostic procedures in the urinary tract within ICD-10-PCS.
Questions About This Page
How many billable codes are in the CT6 range?
Of the 7 codes in this range, 6 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 CT6 range classify?
The range classifies Nonimaging Nuclear Medicine Assay procedures, introduction of radioactive materials into the body for the study of body fluids and blood elements, by the detection of radioactive emissions, performed on the urinary 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.
