DRG 186
Medical DRGPleural Effusion with MCC
What is MS-DRG 186?
MS-DRG 186 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 04 (MDC 04) with a Major Complication or Comorbidity (MCC). It maps to 5 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 1.5585 with a geometric mean length of stay of 4.2 days and an arithmetic mean of 5.6 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.
Classification
Medical DRG
Diagnosis-driven grouping
Linked Codes
5 diagnosis
Billable Dx
100%
5 of 5 shown
FY 2026 Payment Data
Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).
Relative Weight
1.5585
Payment multiplier vs. average case (1.0)
Geometric Mean LOS
4.2 days
Used for transfer payment calculations
Arithmetic Mean LOS
5.6 days
Average length of stay
Post-Acute Transfer
Yes
Subject to the post-acute care transfer policy
Related MS-DRGs in This Severity Group
The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.