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MS-DRG v44.0 · MDC 21: Injuries, Poisonings and Toxic Effects of Drugs

918 — Poisoning and Toxic Effects of Drugs without MCC

This DRG is subject to the post-acute care transfer policy. Source: CMS MS-DRG v44.0 and FY2027 IPPS final rule. Page updated September 29, 2026.
Relative weight
0.872
Geometric mean LOS
2.4 days
Arithmetic mean LOS
3.3 days
Type
Medical

About MS-DRG 918

MS-DRG 918, Poisoning and Toxic Effects of Drugs without MCC, is a medical DRG in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.

Its FY2027 relative weight is 0.872, so Medicare's base payment for this DRG is about 0.87 times the average inpatient case (below average), before hospital-specific adjustments. The geometric mean length of stay is 2.4 days and the arithmetic mean is 3.3 days.

It belongs to a 2-level severity family: DRG 917 (with MCC, weight 1.57) and DRG 918 (without MCC, weight 0.872). The highest-severity level carries 1.8 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.

1,499 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 918 (1,499)

Chapter 13: Diseases of the musculoskeletal system and connective tissue

Chapter 19: Injury, poisoning and certain other consequences of external causes

Common questions about DRG 918

What is the relative weight of DRG 918?

0.872 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.

What is the average length of stay for DRG 918?

The geometric mean length of stay is 2.4 days; the arithmetic mean is 3.3 days.

Is DRG 918 medical or surgical?

DRG 918 is a medical DRG.