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

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group 07T9 includes procedures performed to resect lymphatic structures in the left internal mammary region. These ICD-10-PCS codes are used for inpatient documentation when a complete removal of the left internal mammary lymphatic tissue is performed. Accurate coding within the ICD-10-PCS 07T9 group is essential for proper inpatient reimbursement, as it captures the procedure performed and determines appropriate case mix and payment.

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Internal Mammary, Left Resection Procedure Overview

Procedures in ICD-10 PCS 07T9 involve resection of lymphatic tissue in the left internal mammary region and target the lymphatic and hemic systems. These operations remove all of the specified left internal mammary lymphatic structure. Accurate coding of these resections ensures inpatient records reflect the procedure performed and supports appropriate case mix grouping and reimbursement.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
0	Section	Medical and Surgical
7	Body System	Lymphatic and Hemic Systems
T	Operation	Resection
9	Body Part	Lymphatic, Internal Mammary, Left

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

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Internal Mammary, Left Resection Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
0	Section	Medical and Surgical
7	Body System	Lymphatic and Hemic Systems
T	Operation	Resection
9	Body Part	Lymphatic, Internal Mammary, Left

When to Use

Use a code from this group when the entire left internal mammary lymphatic tissue is surgically removed during an inpatient stay. Do not use these codes for partial excisions, biopsies, or procedures that include immediate replacement or reconstruction.

ICD-10-PCS Codes

2 rows

ICD-10-PCS Code	Description
07T90ZZ	Resection of Left Internal Mammary Lymphatic, Open Approach
07T94ZZ	Resection of Left Internal Mammary Lymphatic, Percutaneous Endoscopic Approach

DRG Codes

38 rows

DRG Code	Description
143	Other Ear, Nose, Mouth and Throat O.R. Procedures with MCC
144	Other Ear, Nose, Mouth and Throat O.R. Procedures with CC
145	Other Ear, Nose, Mouth and Throat O.R. Procedures without CC/MCC
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
356	Other Digestive System O.R. Procedures with MCC
357	Other Digestive System O.R. Procedures with CC
358	Other Digestive System O.R. Procedures without CC/MCC
515	Other Musculoskeletal System and Connective Tissue O.R. Procedures with MCC

Showing 1–10 of 38

Typical Clinical Scenarios

An adult patient with a known left-sided breast carcinoma presents for a planned inpatient lymphadenectomy because preoperative imaging and sentinel node mapping suggest extensive tumor involvement of the left internal mammary lymphatic chain. The patient is admitted electively for surgical resection of all left internal mammary lymphatic tissue as part of oncologic control and staging. Typical codes: 07T90ZZ
An elderly patient develops progressive, symptomatic lymphedema and recurrent cellulitis localized to the left chest wall after prior mastectomy and radiation; conservative measures have failed and infection risk persists, prompting an inpatient definitive surgical removal of the diseased left internal mammary lymphatic tissue. The goal of the inpatient procedure is complete resection of the affected left internal mammary lymphatics to control infection and reduce lymphedema burden. Typical codes: 07T90ZZ
A patient undergoes an image-guided percutaneous endoscopic procedure for diagnostic evaluation of suspicious left internal mammary nodal tissue but intra-procedural findings confirm grossly abnormal nodes requiring complete excision; the team proceeds with endoscopic resection during the same inpatient encounter. Because the entire left internal mammary lymphatic tissue is removed via a minimally invasive endoscopic route, the percutaneous endoscopic resection code applies. Typical codes: 07T94ZZ

Related Codes

07T0-LYMPHATIC-HEAD-RESECTION

ICD-10-PCS Code For Lymphatic Head: Procedure Code Group Overview

07T1-RIGHT-NECK-RESECTION

ICD-10-PCS Code For Lymphatic Right Neck: Procedure Code Group Overview

07T2-LEFT-NECK-RESECTION

ICD-10-PCS Code For Lymphatic Left Neck: Procedure Code Group Overview

07T3-RIGHT-UPPER-EXTREMITY-CUTTING-OUT-RIGHT-UPPER-EXTREMITY-RESECTION

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

07T4-LEFT-UPPER-EXTREMITY-RESECTION

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

07T5-RIGHT-AXILLARY-RESECTION

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

07T6-LEFT-AXILLARY-RESECTION

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

07T7-LYMPHATIC-THORAX-RESECTION

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

07T8-INTERNAL-MAMMARY-RIGHT-RESECTION

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

07TB-MESENTERIC-RESECTION

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

Showing 1–10 of 20

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

2 rows

ICD-10-PCS Code	Description
07T90ZZ	Resection of Left Internal Mammary Lymphatic, Open Approach
07T94ZZ	Resection of Left Internal Mammary Lymphatic, Percutaneous Endoscopic Approach

DRG Codes

38 rows

DRG Code	Description
143	Other Ear, Nose, Mouth and Throat O.R. Procedures with MCC
144	Other Ear, Nose, Mouth and Throat O.R. Procedures with CC
145	Other Ear, Nose, Mouth and Throat O.R. Procedures without CC/MCC
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
356	Other Digestive System O.R. Procedures with MCC
357	Other Digestive System O.R. Procedures with CC
358	Other Digestive System O.R. Procedures without CC/MCC
515	Other Musculoskeletal System and Connective Tissue O.R. Procedures with MCC

Showing 1–10 of 38

Typical Clinical Scenarios

An adult patient with a known left-sided breast carcinoma presents for a planned inpatient lymphadenectomy because preoperative imaging and sentinel node mapping suggest extensive tumor involvement of the left internal mammary lymphatic chain. The patient is admitted electively for surgical resection of all left internal mammary lymphatic tissue as part of oncologic control and staging. Typical codes: 07T90ZZ
An elderly patient develops progressive, symptomatic lymphedema and recurrent cellulitis localized to the left chest wall after prior mastectomy and radiation; conservative measures have failed and infection risk persists, prompting an inpatient definitive surgical removal of the diseased left internal mammary lymphatic tissue. The goal of the inpatient procedure is complete resection of the affected left internal mammary lymphatics to control infection and reduce lymphedema burden. Typical codes: 07T90ZZ
A patient undergoes an image-guided percutaneous endoscopic procedure for diagnostic evaluation of suspicious left internal mammary nodal tissue but intra-procedural findings confirm grossly abnormal nodes requiring complete excision; the team proceeds with endoscopic resection during the same inpatient encounter. Because the entire left internal mammary lymphatic tissue is removed via a minimally invasive endoscopic route, the percutaneous endoscopic resection code applies. Typical codes: 07T94ZZ

Related Codes

07T0-LYMPHATIC-HEAD-RESECTION

ICD-10-PCS Code For Lymphatic Head: Procedure Code Group Overview

07T1-RIGHT-NECK-RESECTION

ICD-10-PCS Code For Lymphatic Right Neck: Procedure Code Group Overview

07T2-LEFT-NECK-RESECTION

ICD-10-PCS Code For Lymphatic Left Neck: Procedure Code Group Overview

07T3-RIGHT-UPPER-EXTREMITY-CUTTING-OUT-RIGHT-UPPER-EXTREMITY-RESECTION

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

07T4-LEFT-UPPER-EXTREMITY-RESECTION

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

07T5-RIGHT-AXILLARY-RESECTION

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

07T6-LEFT-AXILLARY-RESECTION

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

07T7-LYMPHATIC-THORAX-RESECTION

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

07T8-INTERNAL-MAMMARY-RIGHT-RESECTION

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

07TB-MESENTERIC-RESECTION

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

Showing 1–10 of 20

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 Left Internal Mammary: Procedure Code Group Overview

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

Internal Mammary, Left Resection Procedure Overview

Code Attributes

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

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

Internal Mammary, Left Resection Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which procedures are included in ICD-10-PCS code group 07T9?

What is the operation type and body system represented by 07T9 codes?

When should these ICD-10-PCS codes be used in inpatient documentation?

How do codes in the 07T9 group affect reimbursement and DRG assignment?

What are the approach options coded in this group and their code values?

References

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which procedures are included in ICD-10-PCS code group 07T9?

What is the operation type and body system represented by 07T9 codes?

When should these ICD-10-PCS codes be used in inpatient documentation?

How do codes in the 07T9 group affect reimbursement and DRG assignment?

What are the approach options coded in this group and their code values?

References