MS-DRG v44.0 · MDC 18: Infectious and Parasitic Diseases, Systemic or Unspecified Sites
853 — Infectious and Parasitic Diseases with O.R. Procedures with MCC
- Relative weight
- 4.9306
- Geometric mean LOS
- 9.2 days
- Arithmetic mean LOS
- 12.2 days
- Type
- Surgical
About MS-DRG 853
MS-DRG 853, Infectious and Parasitic Diseases with O.R. Procedures with MCC, is a surgical DRG in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
Its FY2027 relative weight is 4.9306, so Medicare's base payment for this DRG is about 4.93 times the average inpatient case, before hospital-specific adjustments. The geometric mean length of stay is 9.2 days and the arithmetic mean is 12.2 days.
It belongs to a 3-level severity family: DRG 853 (with MCC, weight 4.9306), DRG 854 (with CC, weight 2.0095) and DRG 855 (without CC/MCC, weight 1.451). The highest-severity level carries 3.4 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.
ICD-10-CM codes that group to DRG 853 (0)
This DRG is assigned by procedure, not by a diagnosis list.
Common questions about DRG 853
What is the relative weight of DRG 853?
- 4.9306 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 853?
- The geometric mean length of stay is 9.2 days; the arithmetic mean is 12.2 days.
Is DRG 853 medical or surgical?
- DRG 853 is a surgical DRG.