021L4Z8ICD-10-PCS Code: Bypass Left Ventricle to Right Internal Mammary, Percutaneous Endoscopic Approach

Potential MS-DRG Relationships (FY2026)

The MS-DRG grouper treats this as an operating room procedure. It appears in the surgical logic of 2 MS-DRGs:

• MDC 05 — Other Cardiothoracic Procedures: DRG 228, DRG 229

From the CMS MS-DRG Definitions Manual, Appendix E. Actual DRG assignment depends on the complete claim.

Related Codes

Same operation — other Body Part

Same table and root operation, differing only in the body part character.

02104Z8 — Bypass Coronary Artery, One Artery from Right Internal Mammary, Percutaneous Endoscopic Approach, 02114Z8 — Bypass Coronary Artery, Two Arteries from Right Internal Mammary, Percutaneous Endoscopic Approach, 02124Z8 — Bypass Coronary Artery, Three Arteries from Right Internal Mammary, Percutaneous Endoscopic Approach, 02134Z8 — Bypass Coronary Artery, Four or More Arteries from Right Internal Mammary, Percutaneous Endoscopic Approach, 021K4Z8 — Bypass Right Ventricle to Right Internal Mammary, Percutaneous Endoscopic Approach

Same operation — other Approach

Same table and root operation, differing only in the approach character.

021L0Z8 — Bypass Left Ventricle to Right Internal Mammary, Open Approach

Same operation — other Qualifier

Same table and root operation, differing only in the qualifier character.

021L4Z5 — Bypass Left Ventricle to Coronary Circulation, Percutaneous Endoscopic Approach, 021L4Z9 — Bypass Left Ventricle to Left Internal Mammary, Percutaneous Endoscopic Approach, 021L4ZC — Bypass Left Ventricle to Thoracic Artery, Percutaneous Endoscopic Approach, 021L4ZF — Bypass Left Ventricle to Abdominal Artery, Percutaneous Endoscopic Approach, 021L4ZP — Bypass Left Ventricle to Pulmonary Trunk, Percutaneous Endoscopic Approach, 021L4ZQ — Bypass Left Ventricle to Right Pulmonary Artery, Percutaneous Endoscopic Approach, 021L4ZR — Bypass Left Ventricle to Left Pulmonary Artery, Percutaneous Endoscopic Approach, 021L4ZW — Bypass Left Ventricle to Aorta, Percutaneous Endoscopic Approach

Contextual Map

Every relationship of 021L4Z8 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

PCS table

• 021[PCS table]
• Medical and Surgical — Section: Medical and Surgical [Section]: “Medical and Surgical”
• Heart and Great Vessels — Body System: Heart and Great Vessels [Body System]: “Heart and Great Vessels”
• Bypass — Operation: Bypass [Operation]: “Bypass”

MS-DRG participation

• DRG 228 — OTHER CARDIOTHORACIC PROCEDURES WITH MCC [MS-DRG]: “OTHER CARDIOTHORACIC PROCEDURES WITH MCC — Other Cardiothoracic Procedures (MDC 05)”
• DRG 229 — OTHER CARDIOTHORACIC PROCEDURES WITHOUT MCC [MS-DRG]: “OTHER CARDIOTHORACIC PROCEDURES WITHOUT MCC — Other Cardiothoracic Procedures (MDC 05)”

MDC crossing · diagnoses (1844)

• MDC 05 — Diseases and Disorders of the Circulatory System [MDC crossing]: “Diseases and Disorders of the Circulatory System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
• A36.81 — Diphtheritic cardiomyopathy [Same-MDC diagnosis]: “Diphtheritic cardiomyopathy — grouped in MDC 05, the diagnosis side of this code's crossing.” · check together
• A39.50 — Meningococcal carditis, unspecified [Same-MDC diagnosis]: “Meningococcal carditis, unspecified — grouped in MDC 05, the diagnosis side of this code's crossing.” · check together
• A39.51 — Meningococcal endocarditis [Same-MDC diagnosis]: “Meningococcal endocarditis — grouped in MDC 05, the diagnosis side of this code's crossing.” · check together
• A39.52 — Meningococcal myocarditis [Same-MDC diagnosis]: “Meningococcal myocarditis — grouped in MDC 05, the diagnosis side of this code's crossing.” · check together
• A39.53 — Meningococcal pericarditis [Same-MDC diagnosis]: “Meningococcal pericarditis — grouped in MDC 05, the diagnosis side of this code's crossing.” · check together
• and 1839 more

Nearest codes

• 02104Z8 — Bypass Coronary Artery, One Artery from Right Internal Mammary, Percutaneous Endoscopic Approach [One axis away]
• 02114Z8 — Bypass Coronary Artery, Two Arteries from Right Internal Mammary, Percutaneous Endoscopic Approach [One axis away]
• 02124Z8 — Bypass Coronary Artery, Three Arteries from Right Internal Mammary, Percutaneous Endoscopic Approach [One axis away]
• 02134Z8 — Bypass Coronary Artery, Four or More Arteries from Right Internal Mammary, Percutaneous Endoscopic Approach [One axis away]
• 021K4Z8 — Bypass Right Ventricle to Right Internal Mammary, Percutaneous Endoscopic Approach [One axis away]
• 021L0Z8 — Bypass Left Ventricle to Right Internal Mammary, Open Approach [One axis away]
• 021L4Z5 — Bypass Left Ventricle to Coronary Circulation, Percutaneous Endoscopic Approach [One axis away]
• 021L4Z9 — Bypass Left Ventricle to Left Internal Mammary, Percutaneous Endoscopic Approach [One axis away]