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 0799 includes procedures performed to drain lymphatic structures in the left internal mammary region. These ICD-10-PCS codes are used for inpatient documentation when a clinician performs drainage of lymphatic fluid, abscess, or other collections from the left internal mammary lymphatic system. Accurate coding within the ICD-10-PCS 0799 group is essential for proper inpatient reimbursement, as it captures the procedure performed and supports clinical documentation accuracy.

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Lymphatic, Internal Mammary, Left Drainage Procedure Overview

This procedure group includes inpatient drainage procedures directed at the left internal mammary lymphatic structures within the lymphatic and hemic systems. These procedures involve removing fluid, pus, or other collections from lymphatic tissue or channels in the internal mammary region to treat infection, lymphedema, or other fluid-accumulation conditions. Accurate ICD-10-PCS coding of these drainage procedures ensures the hospital record reflects the clinical care provided and supports appropriate inpatient reimbursement.

Code Attributes

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

Code Attributes

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

When to Use

Use a code from this group when the clinical procedure performed is drainage of fluid, pus, or other collections from the left internal mammary lymphatic structures. Select the specific ICD-10-PCS code that matches the drainage approach and any qualifying attributes documented in the operative record.

ICD-10-PCS Codes

12 rows

ICD-10-PCS Code	Description
079900Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Open Approach
07990ZX	Drainage of Left Internal Mammary Lymphatic, Open Approach, Diagnostic
07990ZZ	Drainage of Left Internal Mammary Lymphatic, Open Approach
079930Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Percutaneous Approach
07993ZX	Drainage of Left Internal Mammary Lymphatic, Percutaneous Approach, Diagnostic
07993ZZ	Drainage of Left Internal Mammary Lymphatic, Percutaneous Approach
079940Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Percutaneous Endoscopic Approach
07994ZX	Drainage of Left Internal Mammary Lymphatic, Percutaneous Endoscopic Approach, Diagnostic
07994ZZ	Drainage of Left Internal Mammary Lymphatic, Percutaneous Endoscopic Approach
079980Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Via Natural or Artificial Opening Endoscopic

Showing 1–10 of 12

DRG Codes

19 rows

DRG Code	Description
040	Peripheral, Cranial Nerve and Other Nervous System Procedures with MCC
041	Peripheral, Cranial Nerve and Other Nervous System Procedures with CC or Peripheral Neurostimulator
042	Peripheral, Cranial Nerve and Other Nervous System Procedures without CC/MCC
264	Other Circulatory System O.R. Procedures
515	Other Musculoskeletal System and Connective Tissue O.R. Procedures with MCC
516	Other Musculoskeletal System and Connective Tissue O.R. Procedures with CC
517	Other Musculoskeletal System and Connective Tissue O.R. Procedures without CC/MCC
579	Other Skin, Subcutaneous Tissue and Breast Procedures with MCC
580	Other Skin, Subcutaneous Tissue and Breast Procedures with CC
581	Other Skin, Subcutaneous Tissue and Breast Procedures without CC/MCC

Showing 1–10 of 19

Typical Clinical Scenarios

An adult patient presents to the emergency department with a rapidly enlarging, painful fluctuant mass along the left parasternal chest wall after recent chest wall trauma, with systemic signs of infection (fever, leukocytosis). Imaging demonstrates a left internal mammary lymphatic abscess requiring prompt inpatient drainage to control sepsis and relieve local compression; an open or percutaneous drainage procedure is performed depending on access and surgeon judgment. Typical codes: 07990ZZ, 079930Z
A patient with chronic lymphedema of the left anterior chest following mastectomy and axillary lymph node dissection is admitted for a planned inpatient procedure to evacuate persistent lymphatic fluid collections that have failed conservative therapy; because endoscopic visualization is used to localize and evacuate the collection, a percutaneous endoscopic drainage is performed. Typical codes: 07994ZZ, 079940Z
A postoperative patient develops a recurrent left internal mammary lymphatic collection after prior percutaneous drainage, now with persistent drainage through a catheter and cellulitis; the team performs an open drainage with placement of a drainage device to ensure sustained evacuation and facilitate wound care. Typical codes: 079900Z, 07990ZX

Related Codes

0790-LYMPHATIC-HEAD-DRAINAGE

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

0791-RIGHT-NECK-DRAINAGE

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

0792-LEFT-NECK-DRAINAGE

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

0793-RIGHT-UPPER-EXTREMITY-DRAINAGE

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

0794-LEFT-UPPER-EXTREMITY-DRAINAGE

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

0795-RIGHT-AXILLARY-DRAINAGE

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

0796-LEFT-AXILLARY-DRAINAGE

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

0797-LYMPHATIC-THORAX-DRAINAGE

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

0798-INTERNAL-MAMMARY-RIGHT-DRAINAGE

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

079B-MESENTERIC-DRAINAGE

ICD-10-PCS Code For Lymphatic 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

12 rows

ICD-10-PCS Code	Description
079900Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Open Approach
07990ZX	Drainage of Left Internal Mammary Lymphatic, Open Approach, Diagnostic
07990ZZ	Drainage of Left Internal Mammary Lymphatic, Open Approach
079930Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Percutaneous Approach
07993ZX	Drainage of Left Internal Mammary Lymphatic, Percutaneous Approach, Diagnostic
07993ZZ	Drainage of Left Internal Mammary Lymphatic, Percutaneous Approach
079940Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Percutaneous Endoscopic Approach
07994ZX	Drainage of Left Internal Mammary Lymphatic, Percutaneous Endoscopic Approach, Diagnostic
07994ZZ	Drainage of Left Internal Mammary Lymphatic, Percutaneous Endoscopic Approach
079980Z	Drainage of Left Internal Mammary Lymphatic with Drainage Device, Via Natural or Artificial Opening Endoscopic

Showing 1–10 of 12

DRG Codes

19 rows

DRG Code	Description
040	Peripheral, Cranial Nerve and Other Nervous System Procedures with MCC
041	Peripheral, Cranial Nerve and Other Nervous System Procedures with CC or Peripheral Neurostimulator
042	Peripheral, Cranial Nerve and Other Nervous System Procedures without CC/MCC
264	Other Circulatory System O.R. Procedures
515	Other Musculoskeletal System and Connective Tissue O.R. Procedures with MCC
516	Other Musculoskeletal System and Connective Tissue O.R. Procedures with CC
517	Other Musculoskeletal System and Connective Tissue O.R. Procedures without CC/MCC
579	Other Skin, Subcutaneous Tissue and Breast Procedures with MCC
580	Other Skin, Subcutaneous Tissue and Breast Procedures with CC
581	Other Skin, Subcutaneous Tissue and Breast Procedures without CC/MCC

Showing 1–10 of 19

Typical Clinical Scenarios

An adult patient presents to the emergency department with a rapidly enlarging, painful fluctuant mass along the left parasternal chest wall after recent chest wall trauma, with systemic signs of infection (fever, leukocytosis). Imaging demonstrates a left internal mammary lymphatic abscess requiring prompt inpatient drainage to control sepsis and relieve local compression; an open or percutaneous drainage procedure is performed depending on access and surgeon judgment. Typical codes: 07990ZZ, 079930Z
A patient with chronic lymphedema of the left anterior chest following mastectomy and axillary lymph node dissection is admitted for a planned inpatient procedure to evacuate persistent lymphatic fluid collections that have failed conservative therapy; because endoscopic visualization is used to localize and evacuate the collection, a percutaneous endoscopic drainage is performed. Typical codes: 07994ZZ, 079940Z
A postoperative patient develops a recurrent left internal mammary lymphatic collection after prior percutaneous drainage, now with persistent drainage through a catheter and cellulitis; the team performs an open drainage with placement of a drainage device to ensure sustained evacuation and facilitate wound care. Typical codes: 079900Z, 07990ZX

Related Codes

0790-LYMPHATIC-HEAD-DRAINAGE

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

0791-RIGHT-NECK-DRAINAGE

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

0792-LEFT-NECK-DRAINAGE

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

0793-RIGHT-UPPER-EXTREMITY-DRAINAGE

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

0794-LEFT-UPPER-EXTREMITY-DRAINAGE

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

0795-RIGHT-AXILLARY-DRAINAGE

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

0796-LEFT-AXILLARY-DRAINAGE

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

0797-LYMPHATIC-THORAX-DRAINAGE

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

0798-INTERNAL-MAMMARY-RIGHT-DRAINAGE

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

079B-MESENTERIC-DRAINAGE

ICD-10-PCS Code For Lymphatic 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

Lymphatic, Internal Mammary, Left Drainage 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

Lymphatic, Internal Mammary, Left Drainage 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 0799 represent?

What types of clinical procedures are captured within the 0799 code group?

How are individual codes in the 0799 group differentiated?

Why is accurate coding within ICD-10-PCS group 0799 important for hospitals?

Which DRG categories may relate to procedures coded from the 0799 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 0799 represent?

What types of clinical procedures are captured within the 0799 code group?

How are individual codes in the 0799 group differentiated?

Why is accurate coding within ICD-10-PCS group 0799 important for hospitals?

Which DRG categories may relate to procedures coded from the 0799 group?

References