MS-DRG v44.0 · MDC 08: Diseases and Disorders of the Musculoskeletal System and Connective Tissue
404 — Hip or Knee Procedures with Principal Diagnosis of Periprosthetic Joint Infection without MCC
- Relative weight
- 3.2513
- Geometric mean LOS
- 4.6 days
- Arithmetic mean LOS
- 5.7 days
- Type
- Surgical
About MS-DRG 404
MS-DRG 404, Hip or Knee Procedures with Principal Diagnosis of Periprosthetic Joint Infection without MCC, is a surgical DRG in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
Its FY2027 relative weight is 3.2513, so Medicare's base payment for this DRG is about 3.25 times the average inpatient case, before hospital-specific adjustments. The geometric mean length of stay is 4.6 days and the arithmetic mean is 5.7 days.
It belongs to a 2-level severity family: DRG 403 (with MCC or Insertion of Antibiotic-eluting Bone Void Filler, weight 5.0061) and DRG 404 (without MCC, weight 3.2513). The highest-severity level carries 1.5 times the weight of the lowest, which is why documenting CC and MCC conditions matters.
It is subject to Medicare's post-acute care transfer policy, so payment can be reduced when a patient with a shorter-than-average stay is discharged to a skilled nursing facility, home health or another post-acute setting.
4 ICD-10-CM diagnosis codes are part of this DRG's grouping logic; they are listed below.
ICD-10-CM codes that group to DRG 404 (4)
Chapter 19: Injury, poisoning and certain other consequences of external causes
- T84.51XAInfection and inflammatory reaction due to internal right hip prosthesis, initial encounter
- T84.52XAInfection and inflammatory reaction due to internal left hip prosthesis, initial encounter
- T84.53XAInfection and inflammatory reaction due to internal right knee prosthesis, initial encounter
- T84.54XAInfection and inflammatory reaction due to internal left knee prosthesis, initial encounter
Common questions about DRG 404
What is the relative weight of DRG 404?
- 3.2513 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 404?
- The geometric mean length of stay is 4.6 days; the arithmetic mean is 5.7 days.
Is DRG 404 medical or surgical?
- DRG 404 is a surgical DRG.