555 MS-DRG: SIGNS AND SYMPTOMS OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH MCC
MS-DRG 555 groups Medicare inpatient hospital stays for: SIGNS AND SYMPTOMS OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH MCC. This is a medical 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 FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 08 — Diseases and Disorders of the Musculoskeletal System and Connective Tissue |
| DRG Type | Medical |
| Severity Level | MCC |
| Relative Weight | 1.2913 |
| Relative Weight (10% Cap Applied) | 1.2913 |
| Geometric Mean Length of Stay | 3.7 days |
| Arithmetic Mean Length of Stay | 4.8 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
247 diagnosis codes can drive assignment here: M25.10, M25.111, M25.112, M25.119, M25.121, M25.122, M25.129, M25.131, M25.132, M25.139, M25.141, M25.142 and 235 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 555 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]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (247)
- M25.10 — Fistula, unspecified joint[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- M25.111 — Fistula, right shoulder[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- M25.112 — Fistula, left shoulder[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- M25.119 — Fistula, unspecified shoulder[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- M25.121 — Fistula, right elbow[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- M25.122 — Fistula, left elbow[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- M25.129 — Fistula, unspecified elbow[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- M25.131 — Fistula, right wrist[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 239 more
DRG family
- DRG 556 — SIGNS AND SYMPTOMS OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITHOUT MCC[DRG family]: “SIGNS AND SYMPTOMS OF MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITHOUT MCC — same CMS DRG family (555-556), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 555-556) · FY2027
Read from: CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44. All data sources · How to read the labels · How MedCoder verifies its implementation
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources