ICD-10-PCS Code For Thyroid Gland: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group CG12 includes procedures performed to image the thyroid gland using planar nuclear medicine techniques. These ICD-10-PCS codes are used for inpatient documentation when a single-plane nuclear medicine study of thyroid function or uptake is performed with introduction of radioactive materials. Accurate coding within the ICD-10-PCS CG12 group is essential for proper inpatient reimbursement, as it captures the imaging procedure performed and supports clinical documentation accuracy.

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Thyroid Gland Planar Nuclear Medicine Imaging Procedure Overview

This procedure group includes planar nuclear medicine imaging studies of the thyroid gland, involving introduction of radioactive materials to capture single-plane images from emitted radiation. These procedures target the endocrine system and specifically the thyroid gland to evaluate function, uptake, and anatomy. Accurate ICD-10-PCS coding ensures inpatient documentation reflects the imaging performed and supports appropriate case mix and payment.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
G	Body System	Endocrine System
1	Operation	Planar Nuclear Medicine Imaging
2	Body Part	Thyroid Gland

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ICD-10-PCS Code For Thyroid Gland: Procedure Code Group Overview

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Thyroid Gland Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
G	Body System	Endocrine System
1	Operation	Planar Nuclear Medicine Imaging
2	Body Part	Thyroid Gland

When to Use

Use codes from this group when a patient receives radioactive materials specifically for a single-plane nuclear medicine thyroid study during an inpatient encounter. Select the code when the procedure documents planar imaging of the thyroid gland to evaluate uptake or function.

ICD-10-PCS Codes

4 rows

ICD-10-PCS Code	Description
CG121ZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Technetium 99m (Tc-99m)
CG12FZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Iodine 123 (I-123)
CG12GZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Iodine 131 (I-131)
CG12YZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Other Radionuclide

Typical Clinical Scenarios

An elderly patient is admitted with symptomatic thyrotoxicosis and a rapidly enlarging goiter causing compressive symptoms; inpatient evaluation includes functional assessment of thyroid nodules to distinguish hyperfunctioning tissue from cold nodules before urgent medical or surgical management, so single-plane nuclear imaging is performed to assess uptake distribution. Typical codes: CG12FZZ, CG12YZZ
A hospitalized pediatric patient with suspected congenital hypothyroidism and an indeterminate newborn screening result undergoes inpatient thyroid uptake imaging to evaluate gland size, position, and functional uptake when ultrasound is inconclusive; a planar radionuclide study is chosen to localize ectopic tissue and assess function. Typical codes: CG121ZZ, CG12FZZ
A patient recently treated with radioiodine therapy presents with persistent focal uptake on follow-up evaluation and concern for residual hyperfunctioning tissue; during the same admission a diagnostic planar nuclear medicine study is performed to document current uptake patterns to guide further inpatient management. Typical codes: CG12GZZ, CG12YZZ

Related Codes

CG11-PARATHYROID-GLANDS-PLANAR-IMAGING

ICD-10-PCS Code For Parathyroid Glands: Procedure Code Group Overview

CG14-ADRENAL-GLANDS-PLANAR-IMAGING

ICD-10-PCS Code For Adrenal Glands Bilateral: Procedure Code Group Overview

CG1Y-ENDOCRINE-SYSTEM-IMAGING

ICD-10-PCS Code For Endocrine System: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-PCS Codes

4 rows

ICD-10-PCS Code	Description
CG121ZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Technetium 99m (Tc-99m)
CG12FZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Iodine 123 (I-123)
CG12GZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Iodine 131 (I-131)
CG12YZZ	Planar Nuclear Medicine Imaging of Thyroid Gland using Other Radionuclide

Typical Clinical Scenarios

An elderly patient is admitted with symptomatic thyrotoxicosis and a rapidly enlarging goiter causing compressive symptoms; inpatient evaluation includes functional assessment of thyroid nodules to distinguish hyperfunctioning tissue from cold nodules before urgent medical or surgical management, so single-plane nuclear imaging is performed to assess uptake distribution. Typical codes: CG12FZZ, CG12YZZ
A hospitalized pediatric patient with suspected congenital hypothyroidism and an indeterminate newborn screening result undergoes inpatient thyroid uptake imaging to evaluate gland size, position, and functional uptake when ultrasound is inconclusive; a planar radionuclide study is chosen to localize ectopic tissue and assess function. Typical codes: CG121ZZ, CG12FZZ
A patient recently treated with radioiodine therapy presents with persistent focal uptake on follow-up evaluation and concern for residual hyperfunctioning tissue; during the same admission a diagnostic planar nuclear medicine study is performed to document current uptake patterns to guide further inpatient management. Typical codes: CG12GZZ, CG12YZZ

Related Codes

CG11-PARATHYROID-GLANDS-PLANAR-IMAGING

ICD-10-PCS Code For Parathyroid Glands: Procedure Code Group Overview

CG14-ADRENAL-GLANDS-PLANAR-IMAGING

ICD-10-PCS Code For Adrenal Glands Bilateral: Procedure Code Group Overview

CG1Y-ENDOCRINE-SYSTEM-IMAGING

ICD-10-PCS Code For Endocrine System: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-PCS Code For Thyroid Gland: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Thyroid Gland: Procedure Code Group Overview policy alerts

Thyroid Gland Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

ICD-10-PCS Code For Thyroid Gland: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Thyroid Gland: Procedure Code Group Overview policy alerts

Thyroid Gland Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS section and body system does the CG12 code group belong to?

What operation and body part are described by codes in CG12?

What specific radionuclides are represented within the CG12 code group?

When should CG12 codes be used in inpatient documentation?

How does accurate coding of CG12 impact reimbursement and clinical documentation?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS section and body system does the CG12 code group belong to?

What operation and body part are described by codes in CG12?

What specific radionuclides are represented within the CG12 code group?

When should CG12 codes be used in inpatient documentation?

How does accurate coding of CG12 impact reimbursement and clinical documentation?

References