MS-DRG v44.0 · MDC 04: Diseases and Disorders of the Respiratory System
164 — Major Chest Procedures with CC
- Relative weight
- 2.5157
- Geometric mean LOS
- 3.2 days
- Arithmetic mean LOS
- 4 days
- Type
- Surgical
About MS-DRG 164
MS-DRG 164, Major Chest Procedures with CC, is a surgical DRG in MDC 04 (Diseases and Disorders of the Respiratory System) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
Its FY2027 relative weight is 2.5157, so Medicare's base payment for this DRG is about 2.52 times the average inpatient case, before hospital-specific adjustments. The geometric mean length of stay is 3.2 days and the arithmetic mean is 4 days.
It belongs to a 3-level severity family: DRG 163 (with MCC, weight 4.4892), DRG 164 (with CC, weight 2.5157) and DRG 165 (without CC/MCC, weight 1.9294). The highest-severity level carries 2.3 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 164 (0)
This DRG is assigned by procedure, not by a diagnosis list.
Common questions about DRG 164
What is the relative weight of DRG 164?
- 2.5157 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 164?
- The geometric mean length of stay is 3.2 days; the arithmetic mean is 4 days.
Is DRG 164 medical or surgical?
- DRG 164 is a surgical DRG.