ICD-10-PCS 2027 procedure code
CG421ZZNonimaging Nuclear Medicine Uptake of Thyroid Gland using Technetium 99m (Tc-99m)
Short description: Nonimag Nucl Med Uptake Thyroid Gland w Technetium 99m
Code unchanged since ICD-10-PCS took effect on October 1, 2015. Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data
About CG421ZZ
CG421ZZ is the ICD-10-PCS code for a nonimaging nuclear medicine uptake procedure on the thyroid gland using a technetium 99m (tc-99m) approach with none (qualifier: none). In ICD-10-PCS, nonimaging nuclear medicine uptake means introduction of radioactive materials into the body for measurements of organ function, from the detection of radioactive emissions.
In plain terms, this corresponds to thyroid scan and radioisotope function studies, the ICD-9-CM procedure title it maps to (92.01).
The same procedure with a different approach is coded CG42FZZ (iodine 123 (I-123)), CG42GZZ (iodine 131 (I-131)) and CG42YZZ (other radionuclide).
It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.
It has been valid since ICD-10-PCS took effect on October 1, 2015.
What each character means
- 1. Section
- CNuclear Medicine
- 2. Body System
- GEndocrine System
- 3. Type
- 4Nonimaging Nuclear Medicine Uptake
Introduction of radioactive materials into the body for measurements of organ function, from the detection of radioactive emissions
- 4. Body Part
- 2Thyroid Gland
- 5. Radionuclide
- 1Technetium 99m (Tc-99m)
- 6. Qualifier
- ZNone
- 7. Qualifier
- ZNone
Other versions of this procedure
Different radionuclide
ICD-9-CM equivalent
Converter →- 92.01Thyroid scan and radioisotope function studiesapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about CG421ZZ
Is CG421ZZ a valid ICD-10-PCS code for 2027?
- Yes. CG421ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for CG421ZZ?
- The CMS GEMs map CG421ZZ to ICD-9-CM 92.01 (Thyroid scan and radioisotope function studies).