MS-DRG v44.0 · MDC 08: Diseases and Disorders of the Musculoskeletal System and Connective Tissue
400 — Knee Procedures with Principal Diagnosis of Infection
- Relative weight
- 2.0248
- Geometric mean LOS
- 5.8 days
- Arithmetic mean LOS
- 6.9 days
- Type
- Surgical
About MS-DRG 400
MS-DRG 400, Knee Procedures with Principal Diagnosis of Infection, 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 2.0248, so Medicare's base payment for this DRG is about 2.02 times the average inpatient case, before hospital-specific adjustments. The geometric mean length of stay is 5.8 days and the arithmetic mean is 6.9 days.
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.
56 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 400 (56)
Chapter 1: Certain infectious and parasitic diseases
Chapter 13: Diseases of the musculoskeletal system and connective tissue
- M00.061Staphylococcal arthritis, right knee
- M00.062Staphylococcal arthritis, left knee
- M00.069Staphylococcal arthritis, unspecified knee
- M00.161Pneumococcal arthritis, right knee
- M00.162Pneumococcal arthritis, left knee
- M00.169Pneumococcal arthritis, unspecified knee
- M00.261Other streptococcal arthritis, right knee
- M00.262Other streptococcal arthritis, left knee
- M00.269Other streptococcal arthritis, unspecified knee
- M00.861Arthritis due to other bacteria, right knee
- M00.862Arthritis due to other bacteria, left knee
- M00.869Arthritis due to other bacteria, unspecified knee
- M00.9Pyogenic arthritis, unspecified
- M01.X61Direct infection of right knee in infectious and parasitic diseases classified elsewhere
- M01.X62Direct infection of left knee in infectious and parasitic diseases classified elsewhere
- M01.X69Direct infection of unspecified knee in infectious and parasitic diseases classified elsewhere
- M71.061Abscess of bursa, right knee
- M71.062Abscess of bursa, left knee
- M71.069Abscess of bursa, unspecified knee
- M71.161Other infective bursitis, right knee
- M71.162Other infective bursitis, left knee
- M71.169Other infective bursitis, unspecified knee
- M86.061Acute hematogenous osteomyelitis, right tibia and fibula
- M86.062Acute hematogenous osteomyelitis, left tibia and fibula
- M86.069Acute hematogenous osteomyelitis, unspecified tibia and fibula
- M86.161Other acute osteomyelitis, right tibia and fibula
- M86.162Other acute osteomyelitis, left tibia and fibula
- M86.169Other acute osteomyelitis, unspecified tibia and fibula
- M86.261Subacute osteomyelitis, right tibia and fibula
- M86.262Subacute osteomyelitis, left tibia and fibula
- M86.269Subacute osteomyelitis, unspecified tibia and fibula
- M86.361Chronic multifocal osteomyelitis, right tibia and fibula
- M86.362Chronic multifocal osteomyelitis, left tibia and fibula
- M86.369Chronic multifocal osteomyelitis, unspecified tibia and fibula
- M86.461Chronic osteomyelitis with draining sinus, right tibia and fibula
- M86.462Chronic osteomyelitis with draining sinus, left tibia and fibula
- M86.469Chronic osteomyelitis with draining sinus, unspecified tibia and fibula
- M86.561Other chronic hematogenous osteomyelitis, right tibia and fibula
- M86.562Other chronic hematogenous osteomyelitis, left tibia and fibula
- M86.569Other chronic hematogenous osteomyelitis, unspecified tibia and fibula
- M86.661Other chronic osteomyelitis, right tibia and fibula
- M86.662Other chronic osteomyelitis, left tibia and fibula
- M86.669Other chronic osteomyelitis, unspecified tibia and fibula
- M86.8X61Other osteomyelitis, right lower leg
- M86.8X62Other osteomyelitis, left lower leg
- M86.8X69Other osteomyelitis, unspecified lower leg
Chapter 19: Injury, poisoning and certain other consequences of external causes
- T84.620AInfection and inflammatory reaction due to internal fixation device of right femur, initial encounter
- T84.621AInfection and inflammatory reaction due to internal fixation device of left femur, initial encounter
- T84.622AInfection and inflammatory reaction due to internal fixation device of right tibia, initial encounter
- T84.623AInfection and inflammatory reaction due to internal fixation device of left tibia, initial encounter
- T84.624AInfection and inflammatory reaction due to internal fixation device of right fibula, initial encounter
- T84.625AInfection and inflammatory reaction due to internal fixation device of left fibula, initial encounter
- T84.629AInfection and inflammatory reaction due to internal fixation device of unspecified bone of leg, initial encounter
- T84.7XXAInfection and inflammatory reaction due to other internal orthopedic prosthetic devices, implants and grafts, initial encounter
Common questions about DRG 400
What is the relative weight of DRG 400?
- 2.0248 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 400?
- The geometric mean length of stay is 5.8 days; the arithmetic mean is 6.9 days.
Is DRG 400 medical or surgical?
- DRG 400 is a surgical DRG.