ICD-10-PCS Code For Myocardium: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group C21G includes procedures performed to introduce radioactive materials for planar nuclear medicine imaging in the myocardium. These ICD-10-PCS codes are used for inpatient documentation when a clinician orders single plane nuclear medicine imaging to evaluate myocardial perfusion or function using radiopharmaceuticals. Accurate coding within the ICD-10-PCS C21G group is essential for proper inpatient reimbursement, as it captures the specific imaging procedure performed and supports clinical documentation accuracy.

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Myocardium Planar Nuclear Medicine Imaging Procedure Overview

Procedures in this group involve introduction of radioactive materials for single plane, or planar, nuclear medicine imaging of the myocardium within the heart. These imaging studies capture radioactive emissions from the myocardium to create diagnostic images that assess myocardial perfusion and function. Accurate ICD-10-PCS coding of these nuclear medicine procedures ensures inpatient documentation reflects the imaging performed and supports appropriate hospital reimbursement.

Code Attributes

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

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ICD-10-PCS Code For Myocardium: Procedure Code Group Overview

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Myocardium Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

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

When to Use

Use a code from this group when a radiopharmaceutical is introduced for single plane nuclear medicine imaging specifically of the myocardium. Codes apply when the inpatient procedure involves capturing radioactive emissions from the heart to generate planar diagnostic images.

ICD-10-PCS Codes

5 rows

ICD-10-PCS Code	Description
C21G1ZZ	Planar Nuclear Medicine Imaging of Myocardium using Technetium 99m (Tc-99m)
C21GDZZ	Planar Nuclear Medicine Imaging of Myocardium using Indium 111 (In-111)
C21GSZZ	Planar Nuclear Medicine Imaging of Myocardium using Thallium 201 (Tl-201)
C21GYZZ	Planar Nuclear Medicine Imaging of Myocardium using Other Radionuclide
C21GZZZ	Planar Nuclear Medicine Imaging of Myocardium

Typical Clinical Scenarios

An elderly patient is admitted with acute chest pain and non-diagnostic ECG changes; serial troponins are inconclusive but clinical concern for ischemia remains. A myocardial perfusion planar nuclear medicine study is performed urgently to assess regional perfusion and help differentiate ischemia from noncardiac pain using technetium-99m radiotracer. The procedure is ordered and completed during the inpatient stay to guide immediate medical management. Typical codes: C21G1ZZ
A middle-aged patient with known coronary artery disease is hospitalized electively for risk stratification before noncardiac major surgery due to reduced exercise tolerance. A planned single-plane myocardial perfusion imaging study using thallium-201 is performed during the admission to evaluate myocardial blood flow and inform perioperative cardiac risk assessment. The planar nuclear medicine study is part of the inpatient preoperative cardiac evaluation. Typical codes: C21GSZZ
A patient with prior inconclusive radionuclide testing had an initial tracer that produced suboptimal images; they are readmitted for repeat single-plane myocardial imaging with a different radionuclide to obtain diagnostic-quality perfusion images. The repeat inpatient planar nuclear medicine study uses indium-111 to capture myocardial emissions and clarify prior indeterminate results. Typical codes: C21GDZZ

ICD-10-PCS Code For Heart Right And Left: Procedure Code Group Overview

C21Y-HEART-PLANAR-IMAGING

ICD-10-PCS Code For Heart: 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

5 rows

ICD-10-PCS Code	Description
C21G1ZZ	Planar Nuclear Medicine Imaging of Myocardium using Technetium 99m (Tc-99m)
C21GDZZ	Planar Nuclear Medicine Imaging of Myocardium using Indium 111 (In-111)
C21GSZZ	Planar Nuclear Medicine Imaging of Myocardium using Thallium 201 (Tl-201)
C21GYZZ	Planar Nuclear Medicine Imaging of Myocardium using Other Radionuclide
C21GZZZ	Planar Nuclear Medicine Imaging of Myocardium

Typical Clinical Scenarios

An elderly patient is admitted with acute chest pain and non-diagnostic ECG changes; serial troponins are inconclusive but clinical concern for ischemia remains. A myocardial perfusion planar nuclear medicine study is performed urgently to assess regional perfusion and help differentiate ischemia from noncardiac pain using technetium-99m radiotracer. The procedure is ordered and completed during the inpatient stay to guide immediate medical management. Typical codes: C21G1ZZ
A middle-aged patient with known coronary artery disease is hospitalized electively for risk stratification before noncardiac major surgery due to reduced exercise tolerance. A planned single-plane myocardial perfusion imaging study using thallium-201 is performed during the admission to evaluate myocardial blood flow and inform perioperative cardiac risk assessment. The planar nuclear medicine study is part of the inpatient preoperative cardiac evaluation. Typical codes: C21GSZZ
A patient with prior inconclusive radionuclide testing had an initial tracer that produced suboptimal images; they are readmitted for repeat single-plane myocardial imaging with a different radionuclide to obtain diagnostic-quality perfusion images. The repeat inpatient planar nuclear medicine study uses indium-111 to capture myocardial emissions and clarify prior indeterminate results. Typical codes: C21GDZZ

ICD-10-PCS Code For Heart Right And Left: Procedure Code Group Overview

C21Y-HEART-PLANAR-IMAGING

ICD-10-PCS Code For Heart: 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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Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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ICD-10-PCS Code For Myocardium: Procedure Code Group Overview

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Myocardium Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

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ICD-10-PCS Code For Myocardium: Procedure Code Group Overview

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Myocardium Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-PCS Code For Myocardium: Procedure Code Group Overview

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

Myocardium Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

ICD-10-PCS Code For Myocardium: Procedure Code Group Overview

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

Myocardium Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which procedures are included in ICD-10-PCS group C21G?

What is the primary purpose of the procedures in C21G?

How does accurate coding in C21G affect inpatient documentation and reimbursement?

What radionuclides are explicitly represented by codes in this group?

Under which ICD-10-PCS section and body system are these procedures classified?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which procedures are included in ICD-10-PCS group C21G?

What is the primary purpose of the procedures in C21G?

How does accurate coding in C21G affect inpatient documentation and reimbursement?

What radionuclides are explicitly represented by codes in this group?

Under which ICD-10-PCS section and body system are these procedures classified?

References