MS-DRG 540: OSTEOMYELITIS WITH CC
MS-DRG 540 is osteomyelitis with cc, in MDC 08 (a medical DRG), at the with-CC (complication or comorbidity) level. Its FY2027 relative weight is 1.3079, so a case here pays more than the average Medicare inpatient stay (weight 1.0), with a geometric mean length of stay of 4.30 days. 220 ICD-10-CM principal diagnoses group into MS-DRGs 539–541 under the CMS definitions manual; the most-searched are listed below.
FY2027 payment factors
- Relative weight
- 1.3079
- Geometric mean LOS
- 4.30
- Arithmetic mean LOS
- 5.50
- Post-acute transfer
- Yes
This DRG is subject to the post-acute care transfer policy: a discharge to a qualifying setting below the mean length of stay is paid per diem rather than in full.
Principal diagnoses that group to MS-DRGs 539–541
From the CMS MS-DRG definitions manual’s principal-diagnosis index: 220 ICD-10-CM codes route here, and the CC/MCC status of the secondary diagnoses decides which of 539–541 the case lands in. The 24 most-searched:
- M86.9Osteomyelitis, unspecified
- M86.171Other acute osteomyelitis, right ankle and foot
- M86.172Other acute osteomyelitis, left ankle and foot
- M46.26Osteomyelitis of vertebra, lumbar region
- M46.28Osteomyelitis of vertebra, sacral and sacrococcygeal region
- M86.671Other chronic osteomyelitis, right ankle and foot
- M86.672Other chronic osteomyelitis, left ankle and foot
- A18.01Tuberculosis of spine
- A02.24Salmonella osteomyelitis
- A18.03Tuberculosis of other bones
- A51.46Secondary syphilitic osteopathy
- A52.77Syphilis of bone and joint
- A54.41Gonococcal spondylopathy
- M46.20Osteomyelitis of vertebra, site unspecified
- M46.21Osteomyelitis of vertebra, occipito-atlanto-axial region
- M46.22Osteomyelitis of vertebra, cervical region
- M46.23Osteomyelitis of vertebra, cervicothoracic region
- M46.24Osteomyelitis of vertebra, thoracic region
- M46.25Osteomyelitis of vertebra, thoracolumbar region
- M46.27Osteomyelitis of vertebra, lumbosacral region
- M46.30Infection of intervertebral disc (pyogenic), site unspecified
- M46.31Infection of intervertebral disc (pyogenic), occipito-atlanto-axial region
- M46.32Infection of intervertebral disc (pyogenic), cervical region
- M46.33Infection of intervertebral disc (pyogenic), cervicothoracic region
196 more codes group here. Open any code above for its full hierarchy, or check a whole claim in the free DRG calculator.
The severity splits
Same base DRG, split by whether a secondary diagnosis is a CC or MCC. The last column is the weight change from MS-DRG 540.
| 539 | OSTEOMYELITIS WITH MCC | 1.9385 | +0.6306 |
| 540 | OSTEOMYELITIS WITH CC | 1.3079 | |
| 541 | OSTEOMYELITIS WITHOUT CC/MCC | 0.8297 | -0.4782 |
All FY2027 MS-DRGs · MDC 08