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

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group CG21 includes procedures performed to image parathyroid glands using tomographic nuclear medicine techniques. These ICD-10-PCS codes are used for inpatient documentation when three-dimensional nuclear medicine imaging is performed to localize or evaluate parathyroid tissue and function. Accurate coding within the ICD-10-PCS CG21 group is essential for proper inpatient reimbursement, as it captures the specific imaging procedure performed and supports clinical documentation accuracy.

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Parathyroid Glands Tomographic Nuclear Medicine Imaging Procedure Overview

This procedure group includes tomographic nuclear medicine imaging studies of the parathyroid glands that capture three-dimensional images from radioactive emissions. These procedures target the endocrine system and involve administering radioactive materials and acquiring tomographic images to localize parathyroid tissue and function. Accurate coding of these tomographic nuclear medicine procedures is important for inpatient reimbursement because it documents the specific imaging modality used 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
2	Operation	Tomographic (Tomo) Nuclear Medicine Imaging
1	Body Part	Parathyroid Glands

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

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Parathyroid Glands Tomographic Nuclear Medicine Imaging Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
G	Body System	Endocrine System
2	Operation	Tomographic (Tomo) Nuclear Medicine Imaging
1	Body Part	Parathyroid Glands

When to Use

Use a code from this group when a patient undergoes tomographic nuclear medicine imaging of the parathyroid glands with radioactive tracer administration for localization or functional assessment. These codes are appropriate for inpatient records documenting three-dimensional nuclear medicine studies of the parathyroid glands.

ICD-10-PCS Codes

3 rows

ICD-10-PCS Code	Description
CG211ZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Parathyroid Glands using Technetium 99m (Tc-99m)
CG21SZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Parathyroid Glands using Thallium 201 (Tl-201)
CG21YZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Parathyroid Glands using Other Radionuclide

Typical Clinical Scenarios

An inpatient admitted from the emergency department with severe symptomatic hypercalcemia and suspected primary hyperparathyroidism after lab results show markedly elevated serum calcium and parathyroid hormone. Tomographic nuclear medicine imaging is ordered to localize hyperfunctioning parathyroid tissue prior to urgent surgical planning. The study uses technetium-99m sestamibi to obtain three-dimensional images of the parathyroid glands for precise localization. Typical codes: CG211ZZ
A patient admitted for planned preoperative localization of a solitary parathyroid adenoma identified on prior outpatient workup with persistent hyperparathyroidism. As part of the inpatient pre-surgical evaluation, tomographic nuclear medicine imaging of the parathyroid glands is performed using thallium-201 to assist the surgical team in targeted gland removal. The study provides three-dimensional functional imaging to confirm the adenoma location. Typical codes: CG21SZZ
An inpatient with recurrent hyperparathyroidism after prior neck surgery and inconclusive ultrasound undergoes repeat tomographic nuclear medicine imaging to detect ectopic or residual parathyroid tissue. An alternative radionuclide (other than Tc-99m or Tl-201) is selected to improve detection of small or atypically located glands and to guide potential re-exploration. Three-dimensional tomographic images are acquired to localize residual functional parathyroid tissue. Typical codes: CG21YZZ

Related Codes

CG2Y-ENDOCRINE-TOMOGRAPHIC-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

3 rows

ICD-10-PCS Code	Description
CG211ZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Parathyroid Glands using Technetium 99m (Tc-99m)
CG21SZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Parathyroid Glands using Thallium 201 (Tl-201)
CG21YZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Parathyroid Glands using Other Radionuclide

Typical Clinical Scenarios

An inpatient admitted from the emergency department with severe symptomatic hypercalcemia and suspected primary hyperparathyroidism after lab results show markedly elevated serum calcium and parathyroid hormone. Tomographic nuclear medicine imaging is ordered to localize hyperfunctioning parathyroid tissue prior to urgent surgical planning. The study uses technetium-99m sestamibi to obtain three-dimensional images of the parathyroid glands for precise localization. Typical codes: CG211ZZ
A patient admitted for planned preoperative localization of a solitary parathyroid adenoma identified on prior outpatient workup with persistent hyperparathyroidism. As part of the inpatient pre-surgical evaluation, tomographic nuclear medicine imaging of the parathyroid glands is performed using thallium-201 to assist the surgical team in targeted gland removal. The study provides three-dimensional functional imaging to confirm the adenoma location. Typical codes: CG21SZZ
An inpatient with recurrent hyperparathyroidism after prior neck surgery and inconclusive ultrasound undergoes repeat tomographic nuclear medicine imaging to detect ectopic or residual parathyroid tissue. An alternative radionuclide (other than Tc-99m or Tl-201) is selected to improve detection of small or atypically located glands and to guide potential re-exploration. Three-dimensional tomographic images are acquired to localize residual functional parathyroid tissue. Typical codes: CG21YZZ

Related Codes

CG2Y-ENDOCRINE-TOMOGRAPHIC-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 Parathyroid Glands: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Parathyroid Glands: Procedure Code Group Overview policy alerts

Parathyroid Glands Tomographic Nuclear Medicine Imaging Procedure Overview

Code Attributes

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

Sign up for ICD-10-PCS Code For Parathyroid Glands: Procedure Code Group Overview policy alerts

Parathyroid Glands Tomographic Nuclear Medicine Imaging Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which procedures are included in the ICD-10-PCS CG21 group?

What is the primary purpose of procedures coded to CG21?

Under which ICD-10-PCS section and body system do CG21 procedures fall?

How does accurate coding of CG21 affect inpatient documentation and payment?

What radionuclide options are represented by the individual CG21 codes?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which procedures are included in the ICD-10-PCS CG21 group?

What is the primary purpose of procedures coded to CG21?

Under which ICD-10-PCS section and body system do CG21 procedures fall?

How does accurate coding of CG21 affect inpatient documentation and payment?

What radionuclide options are represented by the individual CG21 codes?

References