479
BIOPSIES OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITHOUT CC/MCC
MS-DRG 479 groups Medicare inpatient hospital stays for: BIOPSIES OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITHOUT CC/MCC. This is a surgical MS-DRG. It falls under MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue).
Payment & Classification Data
Official CMS values from the current fiscal year's IPPS Final Rule.
| Major Diagnostic Category | MDC 08 — Diseases and Disorders of the Musculoskeletal System and Connective Tissue |
| DRG Type | Surgical |
| Severity Level | None |
| Relative Weight | 1.8589 |
| Relative Weight (10% Cap Applied) | 1.8589 |
| Geometric Mean Length of Stay | 3.3 days |
| Arithmetic Mean Length of Stay | 4.1 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | Yes |
Defining Codes (FY2026)
431 procedure codes appear in its surgical logic (Biopsies of Musculoskeletal System and Connective Tissue: 431): 0MJX0ZZ, 0MJX4ZZ, 0MJY0ZZ, 0MJY4ZZ, 0N900ZX, 0N903ZX, 0N904ZX, 0N910ZX, 0N913ZX, 0N914ZX, 0N930ZX, 0N933ZX and 419 more.
From the CMS MS-DRG Definitions Manual (Appendices B and E). Assignment also depends on severity, discharge status and the rest of the claim.
Contextual Map
Every relationship of 479 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.
Major Diagnostic Category
- MDC 08 — Diseases and Disorders of the Musculoskeletal System and Connective Tissue [MDC]
Defining procedures (431)
- 0MJX0ZZ — Inspection of Upper Bursa and Ligament, Open Approach [Grouper procedure]
- 0MJX4ZZ — Inspection of Upper Bursa and Ligament, Percutaneous Endoscopic Approach [Grouper procedure]
- 0MJY0ZZ — Inspection of Lower Bursa and Ligament, Open Approach [Grouper procedure]
- 0MJY4ZZ — Inspection of Lower Bursa and Ligament, Percutaneous Endoscopic Approach [Grouper procedure]
- 0N900ZX — Drainage of Skull, Open Approach, Diagnostic [Grouper procedure]
- 0N903ZX — Drainage of Skull, Percutaneous Approach, Diagnostic [Grouper procedure]
- 0N904ZX — Drainage of Skull, Percutaneous Endoscopic Approach, Diagnostic [Grouper procedure]
- 0N910ZX — Drainage of Frontal Bone, Open Approach, Diagnostic [Grouper procedure]
- and 423 more
DRG family
- DRG 477 — BIOPSIES OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH MCC [DRG family]: “BIOPSIES OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH MCC — same CMS DRG family (477-479), split by severity.”
- DRG 478 — BIOPSIES OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH CC [DRG family]: “BIOPSIES OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH CC — same CMS DRG family (477-479), split by severity.”