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 03H1 includes procedures performed to insert a nonbiological appliance that monitors, assists, performs, or prevents a physiological function in the left internal mammary artery. These ICD-10-PCS codes are used for inpatient documentation when a device is placed in the left internal mammary artery to support or monitor physiological function. Accurate coding within the ICD-10-PCS 03H1 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 Insertion Procedure Overview

This procedure group includes insertion procedures performed on the left internal mammary artery within the upper arteries body system. These procedures involve placing a nonbiological appliance that monitors, assists, performs, or prevents a physiological function but does not replace a body part. Accurate coding of these insertion procedures is important for inpatient reimbursement because it captures the specific action and anatomical site, supporting correct case mix and payment.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
0	Section	Medical and Surgical
3	Body System	Upper Arteries
H	Operation	Insertion
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 Insertion Procedure Overview

Code Attributes

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

When to Use

Use a code from this group when a device is placed into the left internal mammary artery during an inpatient encounter to monitor or support arterial function. Do not use these codes for replacement of the artery or for procedures on other arteries or other body systems.

ICD-10-PCS Codes

6 rows

ICD-10-PCS Code	Description
03H103Z	Insertion of Infusion Device into Left Internal Mammary Artery, Open Approach
03H10DZ	Insertion of Intraluminal Device into Left Internal Mammary Artery, Open Approach
03H133Z	Insertion of Infusion Device into Left Internal Mammary Artery, Percutaneous Approach
03H13DZ	Insertion of Intraluminal Device into Left Internal Mammary Artery, Percutaneous Approach
03H143Z	Insertion of Infusion Device into Left Internal Mammary Artery, Percutaneous Endoscopic Approach
03H14DZ	Insertion of Intraluminal Device into Left Internal Mammary Artery, Percutaneous Endoscopic Approach

DRG Codes

18 rows

DRG Code	Description
166	Other Respiratory System O.R. Procedures with MCC
167	Other Respiratory System O.R. Procedures with CC
168	Other Respiratory System O.R. Procedures without CC/MCC
252	Other Vascular Procedures with MCC
253	Other Vascular Procedures with CC
254	Other Vascular Procedures without CC/MCC
820	Lymphoma and Leukemia with Major O.R. Procedures with MCC
821	Lymphoma and Leukemia with Major O.R. Procedures with CC
822	Lymphoma and Leukemia with Major O.R. Procedures without CC/MCC
826	Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with MCC

Showing 1–10 of 18

Typical Clinical Scenarios

An adult patient undergoing planned coronary artery bypass grafting (CABG) during an elective inpatient admission has the left internal mammary artery surgically exposed and a nonbiological infusion catheter is placed into the artery to deliver vasodilators or infusions intraoperatively to assist graft flow monitoring and management; the procedure is performed through an open chest approach as part of the operative plan. Typical codes: 03H103Z, 03H10DZ
A critically ill patient in the cardiac ICU with unstable hemodynamics following myocardial infarction requires percutaneous placement of a monitoring or intraluminal support device into the left internal mammary artery to assess arterial pressure and assist perfusion management; this is done at the bedside via a percutaneous approach during an urgent inpatient stay. Typical codes: 03H133Z, 03H13DZ
A patient who previously had a device placed into the left internal mammary artery develops device malfunction and requires endoscopic-assisted retrieval and replacement of the infusion or intraluminal appliance during a non-elective inpatient procedure; the team performs a percutaneous endoscopic insertion of the replacement device to restore monitoring/assistance function. Typical codes: 03H143Z, 03H14DZ

Related Codes

03H0-INTERNAL-MAMMARY-ARTERY-INSERTION

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

03H2-INNOMINATE-ARTERY-PLACEMENT-INNOMINATE-ARTERY-INSERTION

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

03H3-SUBCLAVIAN-ARTERY-RIGHT-INSERTION

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

03H4-SUBCLAVIAN-ARTERY-LEFT-INSERTION

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

03H5-AXILLARY-ARTERY-RIGHT-INSERTION

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

03H6-LEFT-AXILLARY-ARTERY-INSERTION

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

03H7-BRACHIAL-ARTERY-RIGHT-INSERTION

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

03H8-BRACHIAL-ARTERY-LEFT-INSERTION

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

03H9-ULNAR-ARTERY-RIGHT-INSERTION

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

03HA-LEFT-ULNAR-ARTERY-PUTTING-IN-ULNAR-ARTERY-INSERTION

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

6 rows

ICD-10-PCS Code	Description
03H103Z	Insertion of Infusion Device into Left Internal Mammary Artery, Open Approach
03H10DZ	Insertion of Intraluminal Device into Left Internal Mammary Artery, Open Approach
03H133Z	Insertion of Infusion Device into Left Internal Mammary Artery, Percutaneous Approach
03H13DZ	Insertion of Intraluminal Device into Left Internal Mammary Artery, Percutaneous Approach
03H143Z	Insertion of Infusion Device into Left Internal Mammary Artery, Percutaneous Endoscopic Approach
03H14DZ	Insertion of Intraluminal Device into Left Internal Mammary Artery, Percutaneous Endoscopic Approach

DRG Codes

18 rows

DRG Code	Description
166	Other Respiratory System O.R. Procedures with MCC
167	Other Respiratory System O.R. Procedures with CC
168	Other Respiratory System O.R. Procedures without CC/MCC
252	Other Vascular Procedures with MCC
253	Other Vascular Procedures with CC
254	Other Vascular Procedures without CC/MCC
820	Lymphoma and Leukemia with Major O.R. Procedures with MCC
821	Lymphoma and Leukemia with Major O.R. Procedures with CC
822	Lymphoma and Leukemia with Major O.R. Procedures without CC/MCC
826	Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with MCC

Showing 1–10 of 18

Typical Clinical Scenarios

An adult patient undergoing planned coronary artery bypass grafting (CABG) during an elective inpatient admission has the left internal mammary artery surgically exposed and a nonbiological infusion catheter is placed into the artery to deliver vasodilators or infusions intraoperatively to assist graft flow monitoring and management; the procedure is performed through an open chest approach as part of the operative plan. Typical codes: 03H103Z, 03H10DZ
A critically ill patient in the cardiac ICU with unstable hemodynamics following myocardial infarction requires percutaneous placement of a monitoring or intraluminal support device into the left internal mammary artery to assess arterial pressure and assist perfusion management; this is done at the bedside via a percutaneous approach during an urgent inpatient stay. Typical codes: 03H133Z, 03H13DZ
A patient who previously had a device placed into the left internal mammary artery develops device malfunction and requires endoscopic-assisted retrieval and replacement of the infusion or intraluminal appliance during a non-elective inpatient procedure; the team performs a percutaneous endoscopic insertion of the replacement device to restore monitoring/assistance function. Typical codes: 03H143Z, 03H14DZ

Related Codes

03H0-INTERNAL-MAMMARY-ARTERY-INSERTION

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

03H2-INNOMINATE-ARTERY-PLACEMENT-INNOMINATE-ARTERY-INSERTION

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

03H3-SUBCLAVIAN-ARTERY-RIGHT-INSERTION

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

03H4-SUBCLAVIAN-ARTERY-LEFT-INSERTION

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

03H5-AXILLARY-ARTERY-RIGHT-INSERTION

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

03H6-LEFT-AXILLARY-ARTERY-INSERTION

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

03H7-BRACHIAL-ARTERY-RIGHT-INSERTION

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

03H8-BRACHIAL-ARTERY-LEFT-INSERTION

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

03H9-ULNAR-ARTERY-RIGHT-INSERTION

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

03HA-LEFT-ULNAR-ARTERY-PUTTING-IN-ULNAR-ARTERY-INSERTION

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.

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 Insertion 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 Insertion Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which body system and operation does ICD-10-PCS code group 03H1 describe?

What specific procedures are included in the 03H1 code group?

How does accurate coding within 03H1 affect inpatient reimbursement?

Which DRGs may relate to procedures coded from 03H1?

What is the anatomical site described by the 03H1 code group?

References

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which body system and operation does ICD-10-PCS code group 03H1 describe?

What specific procedures are included in the 03H1 code group?

How does accurate coding within 03H1 affect inpatient reimbursement?

Which DRGs may relate to procedures coded from 03H1?

What is the anatomical site described by the 03H1 code group?

References