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

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group CG4Y includes procedures performed to introduce radioactive material for nonimaging uptake measurements in the endocrine system. These ICD-10-PCS codes are used for inpatient documentation when a clinician orders a functional radionuclide uptake study of endocrine organs to evaluate hormone-producing tissue activity. Accurate coding within the ICD-10-PCS CG4Y group is essential for proper inpatient reimbursement, as it captures the specific functional procedure performed and supports clinical documentation accuracy.

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Endocrine System Nonimaging Nuclear Medicine Uptake Procedure Overview

Procedures in this group involve the nonimaging introduction of radioactive material to measure uptake and function of organs within the endocrine system. These studies target endocrine organs such as the thyroid, parathyroids, and other hormone-producing tissues to assess physiological activity rather than produce diagnostic images. Accurate ICD-10-PCS coding of these nonimaging nuclear medicine uptake procedures ensures inpatient records reflect the functional study performed and supports appropriate reimbursement and case mix assignment.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
G	Body System	Endocrine System
4	Operation	Nonimaging Nuclear Medicine Uptake
Y	Body Part	Endocrine System

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

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Endocrine System Nonimaging Nuclear Medicine Uptake Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
G	Body System	Endocrine System
4	Operation	Nonimaging Nuclear Medicine Uptake
Y	Body Part	Endocrine System

When to Use

Use a code from this group when a radionuclide is administered specifically to perform a nonimaging uptake study of an endocrine organ such as the thyroid. These codes apply when the intent is to assess functional uptake rather than to produce imaging studies.

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
CG4YYZZ	Nonimaging Nuclear Medicine Uptake of Endocrine System using Other Radionuclide

Typical Clinical Scenarios

An elderly inpatient with symptomatic thyrotoxicosis admitted for medical management and evaluation of thyroid function. The endocrine team orders a nonimaging radionuclide uptake study to quantify thyroid uptake and assist in differentiating causes of hyperthyroidism while the patient is hospitalized and off antithyroid medications. This functional uptake measurement helps guide urgent treatment decisions. Typical codes: CG4YYZZ
A hospitalized patient with a history of multinodular goiter undergoing preoperative endocrine workup prior to planned thyroid surgery. While inpatient for medical optimization, clinicians perform a nonimaging radionuclide uptake study to determine the distribution of functional thyroid tissue and assist surgical planning. The procedure is performed solely to measure uptake rather than produce diagnostic images. Typical codes: CG4YYZZ
A patient admitted for evaluation of recurrent hypercalcemia after prior parathyroid surgery, with concern for residual or ectopic functional parathyroid tissue. Inpatient nonimaging radionuclide uptake testing is performed to assess endocrine tissue uptake and aid localization of functioning parathyroid tissue as part of the workup for possible reoperation. The study is performed as a functional uptake measurement rather than an imaging procedure. Typical codes: CG4YYZZ

Related Codes

CG42-THYROID-GLAND-NONIMAGING-UPTAKE

ICD-10-PCS Code For Thyroid Gland: 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

1 rows

ICD-10-PCS Code	Description
CG4YYZZ	Nonimaging Nuclear Medicine Uptake of Endocrine System using Other Radionuclide

Typical Clinical Scenarios

An elderly inpatient with symptomatic thyrotoxicosis admitted for medical management and evaluation of thyroid function. The endocrine team orders a nonimaging radionuclide uptake study to quantify thyroid uptake and assist in differentiating causes of hyperthyroidism while the patient is hospitalized and off antithyroid medications. This functional uptake measurement helps guide urgent treatment decisions. Typical codes: CG4YYZZ
A hospitalized patient with a history of multinodular goiter undergoing preoperative endocrine workup prior to planned thyroid surgery. While inpatient for medical optimization, clinicians perform a nonimaging radionuclide uptake study to determine the distribution of functional thyroid tissue and assist surgical planning. The procedure is performed solely to measure uptake rather than produce diagnostic images. Typical codes: CG4YYZZ
A patient admitted for evaluation of recurrent hypercalcemia after prior parathyroid surgery, with concern for residual or ectopic functional parathyroid tissue. Inpatient nonimaging radionuclide uptake testing is performed to assess endocrine tissue uptake and aid localization of functioning parathyroid tissue as part of the workup for possible reoperation. The study is performed as a functional uptake measurement rather than an imaging procedure. Typical codes: CG4YYZZ

Related Codes

CG42-THYROID-GLAND-NONIMAGING-UPTAKE

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

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

Endocrine System Nonimaging Nuclear Medicine Uptake Procedure Overview

Code Attributes

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

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

Endocrine System Nonimaging Nuclear Medicine Uptake 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 code group CG4Y?

What is the specific ICD-10-PCS code format shown for this group?

For what clinical purpose are procedures in CG4Y performed?

How does accurate coding in the CG4Y group affect inpatient documentation and reimbursement?

What code attributes define the CG4Y procedure group?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which procedures are included in the ICD-10-PCS code group CG4Y?

What is the specific ICD-10-PCS code format shown for this group?

For what clinical purpose are procedures in CG4Y performed?

How does accurate coding in the CG4Y group affect inpatient documentation and reimbursement?

What code attributes define the CG4Y procedure group?

References