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

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group CP21 includes procedures performed to obtain three-dimensional nuclear medicine images of the skull by introducing radioactive materials and capturing emitted radiation. These ICD-10-PCS codes are used for inpatient documentation when tomographic nuclear medicine imaging of the skull is performed to assess functional or structural abnormalities of cranial bones and related musculoskeletal structures. Accurate coding within the ICD-10-PCS CP21 group is essential for proper inpatient reimbursement, as it captures the specific imaging procedure performed and supports clinical documentation accuracy.

Customize your policy alerts

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

Get alerted when relevant policies change without checking for updates manually.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

Skull Tomographic Nuclear Medicine Imaging Procedure Overview

This code group covers tomographic nuclear medicine imaging procedures of the skull that introduce radioactive materials to generate three-dimensional images from captured radioactive emissions. These procedures target the musculoskeletal system, specifically the bones and structures of the skull, to evaluate functional and structural information. Accurate coding ensures the inpatient record reflects the imaging performed and supports appropriate case mix assignment and reimbursement.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
P	Body System	Musculoskeletal System
2	Operation	Tomographic (Tomo) Nuclear Medicine Imaging
1	Body Part	Skull

Explore openpayer tools

View all tools

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

Customize your policy alerts

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

Get alerted when relevant policies change without checking for updates manually.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

Skull Tomographic Nuclear Medicine Imaging Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
P	Body System	Musculoskeletal System
2	Operation	Tomographic (Tomo) Nuclear Medicine Imaging
1	Body Part	Skull

When to Use

Use a code from this group when a tomographic nuclear medicine study of the skull is performed that requires administration of radioactive material to capture three-dimensional emission data. These codes apply for inpatient encounters where the imaging procedure is used to evaluate functional or structural conditions of the cranial bones and related musculoskeletal tissues.

ICD-10-PCS Codes

2 rows

ICD-10-PCS Code	Description
CP211ZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Skull using Technetium 99m (Tc-99m)
CP21YZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Skull using Other Radionuclide

Typical Clinical Scenarios

An elderly patient is admitted after progressive focal skull pain and new swelling over a previous craniotomy site with concern for osteomyelitis of the cranial bone. To evaluate bone metabolism and delineate the extent of suspected skull infection, tomographic nuclear medicine imaging of the skull is performed using Technetium 99m to obtain three-dimensional emission images that localize increased radionuclide uptake in the affected bony structures. Typical codes: CP211ZZ
A middle-aged patient with a history of chronic mastoid and skull-base bone disorders is scheduled for inpatient diagnostic workup to assess multifocal bony lesions after inconclusive CT and MRI. As part of the planned evaluation, three-dimensional tomographic nuclear medicine imaging of the skull is performed with an alternative radionuclide to characterize metabolic activity across multiple cranial bone sites and guide further management. Typical codes: CP21YZZ
A patient with persistent localized skull pain and prior radiation therapy to the head presents with concern for radiation-induced osteonecrosis versus recurrent metastatic involvement. To differentiate active bone turnover from chronic changes and to map the extent of viable bone for treatment planning, tomographic nuclear medicine imaging of the skull is obtained using Technetium 99m to capture three-dimensional emission data of the cranial bones. Typical codes: CP211ZZ

Related Codes

CP22-CERVICAL-SPINE-TOMOGRAPHIC-IMAGING

ICD-10-PCS Code For Cervical Spine: Procedure Code Group Overview

CP23-SKULL-AND-CERVICAL-SPINE-TOMOGRAPHIC

ICD-10-PCS Code For Skull And Cervical Spine: Procedure Code Group Overview

CP24-THORAX-TOMOGRAPHIC-NUCLEAR-MEDICINE

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

CP26-PELVIS-TOMOGRAPHIC-IMAGING

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

CP27-SPINE-PELVIS-TOMOGRAPHIC-IMAGING

ICD-10-PCS Code For Spine And Pelvis: Procedure Code Group Overview

CP28-UPPER-EXTREMITY-RIGHT-TOMOGRAPHIC

ICD-10-PCS Code For Upper Extremity Right: Procedure Code Group Overview

CP29-UPPER-EXTREMITY-LEFT-TOMOGRAPHIC

ICD-10-PCS Code For Upper Extremity Left: Procedure Code Group Overview

CP2B-UPPER-EXTREMITIES-BILATERAL-TOMOGRAPHIC

ICD-10-PCS Code For Upper Extremities Bilateral: Procedure Code Group Overview

CP2C-LOWER-EXTREMITY-RIGHT-TOMOGRAPHIC

ICD-10-PCS Code For Lower Extremity, Right: Procedure Code Group Overview

CP2D-LEFT-LOWER-EXTREMITY-TOMOGRAPHIC-IMAGING

ICD-10-PCS Code For Left Lower Extremity: Procedure Code Group Overview

Showing 1–10 of 15

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.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Explore openpayer tools

View all tools

When to Use

ICD-10-PCS Codes

2 rows

ICD-10-PCS Code	Description
CP211ZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Skull using Technetium 99m (Tc-99m)
CP21YZZ	Tomographic (Tomo) Nuclear Medicine Imaging of Skull using Other Radionuclide

Typical Clinical Scenarios

An elderly patient is admitted after progressive focal skull pain and new swelling over a previous craniotomy site with concern for osteomyelitis of the cranial bone. To evaluate bone metabolism and delineate the extent of suspected skull infection, tomographic nuclear medicine imaging of the skull is performed using Technetium 99m to obtain three-dimensional emission images that localize increased radionuclide uptake in the affected bony structures. Typical codes: CP211ZZ
A middle-aged patient with a history of chronic mastoid and skull-base bone disorders is scheduled for inpatient diagnostic workup to assess multifocal bony lesions after inconclusive CT and MRI. As part of the planned evaluation, three-dimensional tomographic nuclear medicine imaging of the skull is performed with an alternative radionuclide to characterize metabolic activity across multiple cranial bone sites and guide further management. Typical codes: CP21YZZ
A patient with persistent localized skull pain and prior radiation therapy to the head presents with concern for radiation-induced osteonecrosis versus recurrent metastatic involvement. To differentiate active bone turnover from chronic changes and to map the extent of viable bone for treatment planning, tomographic nuclear medicine imaging of the skull is obtained using Technetium 99m to capture three-dimensional emission data of the cranial bones. Typical codes: CP211ZZ

Related Codes

CP22-CERVICAL-SPINE-TOMOGRAPHIC-IMAGING

ICD-10-PCS Code For Cervical Spine: Procedure Code Group Overview

CP23-SKULL-AND-CERVICAL-SPINE-TOMOGRAPHIC

ICD-10-PCS Code For Skull And Cervical Spine: Procedure Code Group Overview

CP24-THORAX-TOMOGRAPHIC-NUCLEAR-MEDICINE

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

CP26-PELVIS-TOMOGRAPHIC-IMAGING

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

CP27-SPINE-PELVIS-TOMOGRAPHIC-IMAGING

ICD-10-PCS Code For Spine And Pelvis: Procedure Code Group Overview

CP28-UPPER-EXTREMITY-RIGHT-TOMOGRAPHIC

ICD-10-PCS Code For Upper Extremity Right: Procedure Code Group Overview

CP29-UPPER-EXTREMITY-LEFT-TOMOGRAPHIC

ICD-10-PCS Code For Upper Extremity Left: Procedure Code Group Overview

CP2B-UPPER-EXTREMITIES-BILATERAL-TOMOGRAPHIC

ICD-10-PCS Code For Upper Extremities Bilateral: Procedure Code Group Overview

CP2C-LOWER-EXTREMITY-RIGHT-TOMOGRAPHIC

ICD-10-PCS Code For Lower Extremity, Right: Procedure Code Group Overview

CP2D-LEFT-LOWER-EXTREMITY-TOMOGRAPHIC-IMAGING

ICD-10-PCS Code For Left Lower Extremity: Procedure Code Group Overview

Showing 1–10 of 15

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 Skull: Procedure Code Group Overview

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

Skull Tomographic Nuclear Medicine Imaging Procedure Overview

Code Attributes

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

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

Skull Tomographic Nuclear Medicine Imaging Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

What procedures are included in the CP21 skull code group?

What is the clinical purpose of CP21 skull tomographic imaging?

In which ICD-10-PCS section and body system is the CP21 group classified?

How should CP21 codes be used for inpatient documentation and reimbursement?

Are there related DRGs listed for the CP21 skull code group?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

What procedures are included in the CP21 skull code group?

What is the clinical purpose of CP21 skull tomographic imaging?

In which ICD-10-PCS section and body system is the CP21 group classified?

How should CP21 codes be used for inpatient documentation and reimbursement?

Are there related DRGs listed for the CP21 skull code group?

References