ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group 0371 includes procedures performed to dilate arterial lumens in the left internal mammary artery. These ICD-10-PCS codes are used for inpatient documentation when a clinician performs a dilation of the left internal mammary artery to improve or restore blood flow. Accurate coding within the ICD-10-PCS 0371 group is essential for proper inpatient reimbursement, as it captures the procedure performed and supports clinical documentation accuracy.

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Internal Mammary Artery, Left Dilation Procedure Overview

This procedure group includes dilation of the left internal mammary artery, a vessel in the upper arterial system supplying the chest wall and breast. Procedures involve widening or enlarging the lumen to restore or improve blood flow within the artery. Accurate ICD-10-PCS coding ensures inpatient records reflect the performed dilation and supports appropriate reimbursement and case mix assignment.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
0	Section	Medical and Surgical
3	Body System	Upper Arteries
7	Operation	Dilation
1	Body Part	Internal Mammary Artery, Left

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ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview

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Internal Mammary Artery, Left Dilation Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
0	Section	Medical and Surgical
3	Body System	Upper Arteries
7	Operation	Dilation
1	Body Part	Internal Mammary Artery, Left

When to Use

Use a code from this group when an inpatient procedure involves dilation of the left internal mammary artery to treat stenosis or improve perfusion. Select the specific ICD-10-PCS code that matches the approach and any device used during the dilation.

ICD-10-PCS Codes

33 rows

ICD-10-PCS Code	Description
037104Z	Dilation of Left Internal Mammary Artery with Drug-eluting Intraluminal Device, Open Approach
037105Z	Dilation of Left Internal Mammary Artery with Two Drug-eluting Intraluminal Devices, Open Approach
037106Z	Dilation of Left Internal Mammary Artery with Three Drug-eluting Intraluminal Devices, Open Approach
037107Z	Dilation of Left Internal Mammary Artery with Four or More Drug-eluting Intraluminal Devices, Open Approach
03710D1	Dilation of Left Internal Mammary Artery with Intraluminal Device, using Drug-Coated Balloon, Open Approach
03710DZ	Dilation of Left Internal Mammary Artery with Intraluminal Device, Open Approach
03710EZ	Dilation of Left Internal Mammary Artery with Two Intraluminal Devices, Open Approach
03710FZ	Dilation of Left Internal Mammary Artery with Three Intraluminal Devices, Open Approach
03710GZ	Dilation of Left Internal Mammary Artery with Four or More Intraluminal Devices, Open Approach
03710Z1	Dilation of Left Internal Mammary Artery using Drug-Coated Balloon, Open Approach

Showing 1–10 of 33

DRG Codes

3 rows

DRG Code	Description
252	Other Vascular Procedures with MCC
253	Other Vascular Procedures with CC
254	Other Vascular Procedures without CC/MCC

Typical Clinical Scenarios

An elderly patient with progressive exertional angina and evidence of ischemia on stress testing is admitted for planned revascularization because native graft disease is suspected in a previously placed left internal mammary artery graft to the coronary circulation; during the inpatient procedure the surgeon performs dilation of the left internal mammary artery via an open surgical approach to restore graft patency. Typical codes: 037104Z, 03710ZZ
A middle-aged patient presents emergently with acute limb- or chest-wall ischemic symptoms after thrombosis and critical stenosis of the left internal mammary artery identified on angiography; interventional cardiology performs percutaneous balloon dilation with placement of a drug-eluting intraluminal device to rapidly reestablish blood flow. Typical codes: 037134Z, 03713Z1
A patient with recurrent restenosis of a previously treated left internal mammary artery returns electively for repeat endovascular intervention; the team performs percutaneous endoscopic dilation and deploys two intraluminal devices to treat multifocal lesions and reduce recoil. Typical codes: 03714EZ, 037145Z

ICD-10-PCS Code For Internal Mammary Artery, Right: Procedure Code Group Overview

0372-INNOMINATE-ARTERY-DILATION

ICD-10-PCS Code For Innominate Artery: Procedure Code Group Overview

0373-SUBCLAVIAN-ARTERY-DILATION

ICD-10-PCS Code For Right Subclavian Artery: Procedure Code Group Overview

0374-LEFT-SUBCLAVIAN-ARTERY-DILATION

ICD-10-PCS Code For Subclavian Artery, Left: Procedure Code Group Overview

0375-AXILLARY-ARTERY-DILATION

ICD-10-PCS Code For Axillary Artery, Right: Procedure Code Group Overview

0376-AXILLARY-ARTERY-LEFT-DILATION

ICD-10-PCS Code For Axillary Artery Left: Procedure Code Group Overview

0377-BRACHIAL-ARTERY-RIGHT-DILATION

ICD-10-PCS Code For Brachial Artery Right: Procedure Code Group Overview

0378-LEFT-BRACHIAL-ARTERY-DILATION

ICD-10-PCS Code For Brachial Artery, Left: Procedure Code Group Overview

0379-ULNAR-ARTERY-RIGHT-DILATION

ICD-10-PCS Code For Ulnar Artery, Right: Procedure Code Group Overview

037A-ULNAR-ARTERY-LEFT-DILATION

ICD-10-PCS Code For Ulnar Artery, Left: Procedure Code Group Overview

Showing 1–10 of 29

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

33 rows

ICD-10-PCS Code	Description
037104Z	Dilation of Left Internal Mammary Artery with Drug-eluting Intraluminal Device, Open Approach
037105Z	Dilation of Left Internal Mammary Artery with Two Drug-eluting Intraluminal Devices, Open Approach
037106Z	Dilation of Left Internal Mammary Artery with Three Drug-eluting Intraluminal Devices, Open Approach
037107Z	Dilation of Left Internal Mammary Artery with Four or More Drug-eluting Intraluminal Devices, Open Approach
03710D1	Dilation of Left Internal Mammary Artery with Intraluminal Device, using Drug-Coated Balloon, Open Approach
03710DZ	Dilation of Left Internal Mammary Artery with Intraluminal Device, Open Approach
03710EZ	Dilation of Left Internal Mammary Artery with Two Intraluminal Devices, Open Approach
03710FZ	Dilation of Left Internal Mammary Artery with Three Intraluminal Devices, Open Approach
03710GZ	Dilation of Left Internal Mammary Artery with Four or More Intraluminal Devices, Open Approach
03710Z1	Dilation of Left Internal Mammary Artery using Drug-Coated Balloon, Open Approach

Showing 1–10 of 33

DRG Codes

3 rows

DRG Code	Description
252	Other Vascular Procedures with MCC
253	Other Vascular Procedures with CC
254	Other Vascular Procedures without CC/MCC

Typical Clinical Scenarios

An elderly patient with progressive exertional angina and evidence of ischemia on stress testing is admitted for planned revascularization because native graft disease is suspected in a previously placed left internal mammary artery graft to the coronary circulation; during the inpatient procedure the surgeon performs dilation of the left internal mammary artery via an open surgical approach to restore graft patency. Typical codes: 037104Z, 03710ZZ
A middle-aged patient presents emergently with acute limb- or chest-wall ischemic symptoms after thrombosis and critical stenosis of the left internal mammary artery identified on angiography; interventional cardiology performs percutaneous balloon dilation with placement of a drug-eluting intraluminal device to rapidly reestablish blood flow. Typical codes: 037134Z, 03713Z1
A patient with recurrent restenosis of a previously treated left internal mammary artery returns electively for repeat endovascular intervention; the team performs percutaneous endoscopic dilation and deploys two intraluminal devices to treat multifocal lesions and reduce recoil. Typical codes: 03714EZ, 037145Z

ICD-10-PCS Code For Internal Mammary Artery, Right: Procedure Code Group Overview

0372-INNOMINATE-ARTERY-DILATION

ICD-10-PCS Code For Innominate Artery: Procedure Code Group Overview

0373-SUBCLAVIAN-ARTERY-DILATION

ICD-10-PCS Code For Right Subclavian Artery: Procedure Code Group Overview

0374-LEFT-SUBCLAVIAN-ARTERY-DILATION

ICD-10-PCS Code For Subclavian Artery, Left: Procedure Code Group Overview

0375-AXILLARY-ARTERY-DILATION

ICD-10-PCS Code For Axillary Artery, Right: Procedure Code Group Overview

0376-AXILLARY-ARTERY-LEFT-DILATION

ICD-10-PCS Code For Axillary Artery Left: Procedure Code Group Overview

0377-BRACHIAL-ARTERY-RIGHT-DILATION

ICD-10-PCS Code For Brachial Artery Right: Procedure Code Group Overview

0378-LEFT-BRACHIAL-ARTERY-DILATION

ICD-10-PCS Code For Brachial Artery, Left: Procedure Code Group Overview

0379-ULNAR-ARTERY-RIGHT-DILATION

ICD-10-PCS Code For Ulnar Artery, Right: Procedure Code Group Overview

037A-ULNAR-ARTERY-LEFT-DILATION

ICD-10-PCS Code For Ulnar Artery, Left: Procedure Code Group Overview

Showing 1–10 of 29

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.

OpenPayer

ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview

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Internal Mammary Artery, Left Dilation Procedure Overview

Code Attributes

OpenPayer

ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview

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Internal Mammary Artery, Left Dilation Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview policy alerts

Internal Mammary Artery, Left Dilation Procedure Overview

Code Attributes

ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Internal Mammary Artery, Left: Procedure Code Group Overview policy alerts

Internal Mammary Artery, Left Dilation Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS section and operation describe left internal mammary artery dilation?

What is the purpose of procedures in ICD-10-PCS code group 0371?

How are individual ICD-10-PCS codes for this group formatted in documentation?

Which approaches are represented among the codes in group 0371?

What related DRGs should coders consider when coding a dilation of the left internal mammary artery?

References

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS section and operation describe left internal mammary artery dilation?

What is the purpose of procedures in ICD-10-PCS code group 0371?

How are individual ICD-10-PCS codes for this group formatted in documentation?

Which approaches are represented among the codes in group 0371?

What related DRGs should coders consider when coding a dilation of the left internal mammary artery?

References