548 MS-DRG: SEPTIC ARTHRITIS WITH MCC
MS-DRG 548 groups Medicare inpatient hospital stays for: SEPTIC ARTHRITIS 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 | 1.9519 |
| Relative Weight (10% Cap Applied) | 1.9519 |
| Geometric Mean Length of Stay | 6 days |
| Arithmetic Mean Length of Stay | 8.3 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
155 diagnosis codes can drive assignment here: A02.23, A18.02, A18.09, A39.83, A39.84, A54.40, A54.42, A54.43, A54.49, A66.6, M00.00, M00.011 and 143 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 548 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 (155)
- A02.23 — Salmonella arthritis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A18.02 — Tuberculous arthritis of other joints[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A18.09 — Other musculoskeletal tuberculosis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A39.83 — Meningococcal arthritis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A39.84 — Postmeningococcal arthritis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A54.40 — Gonococcal infection of musculoskeletal system, unspecified[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A54.42 — Gonococcal arthritis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A54.43 — Gonococcal osteomyelitis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 147 more
DRG family
- DRG 549 — SEPTIC ARTHRITIS WITH CC[DRG family]: “SEPTIC ARTHRITIS WITH CC — same CMS DRG family (548-550), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 548-550) · FY2027
- DRG 550 — SEPTIC ARTHRITIS WITHOUT CC/MCC[DRG family]: “SEPTIC ARTHRITIS WITHOUT CC/MCC — same CMS DRG family (548-550), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 548-550) · 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 20, 2026 · All releases and sources