MS-DRG v44.0 · MDC 21: Injuries, Poisonings and Toxic Effects of Drugs
915 — Allergic Reactions with MCC
- Relative weight
- 1.6558
- Geometric mean LOS
- 3.4 days
- Arithmetic mean LOS
- 4.7 days
- Type
- Medical
About MS-DRG 915
MS-DRG 915, Allergic Reactions with 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 1.6558, so Medicare's base payment for this DRG is about 1.66 times the average inpatient case, before hospital-specific adjustments. The geometric mean length of stay is 3.4 days and the arithmetic mean is 4.7 days.
It belongs to a 2-level severity family: DRG 915 (with MCC, weight 1.6558) and DRG 916 (without MCC, weight 0.6928). The highest-severity level carries 2.4 times the weight of the lowest, which is why documenting CC and MCC conditions matters.
25 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 915 (25)
Chapter 19: Injury, poisoning and certain other consequences of external causes
- T78.00XAAnaphylactic reaction due to unspecified food, initial encounter
- T78.01XAAnaphylactic reaction due to peanuts, initial encounter
- T78.02XAAnaphylactic reaction due to shellfish (crustaceans), initial encounter
- T78.03XAAnaphylactic reaction due to other fish, initial encounter
- T78.04XAAnaphylactic reaction due to fruits and vegetables, initial encounter
- T78.05XAAnaphylactic reaction due to tree nuts and seeds, initial encounter
- T78.06XAAnaphylactic reaction due to food additives, initial encounter
- T78.070AAnaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter
- T78.071AAnaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounter
- T78.079AAnaphylactic reaction due to milk and dairy products, unspecified, initial encounter
- T78.080AAnaphylactic reaction due to egg with tolerance to baked egg, initial encounter
- T78.081AAnaphylactic reaction due to egg with reactivity to baked egg, initial encounter
- T78.089AAnaphylactic reaction due to eggs, unspecified, initial encounter
- T78.09XAAnaphylactic reaction due to other food products, initial encounter
- T78.2XXAAnaphylactic shock, unspecified, initial encounter
- T78.3XXAAngioneurotic edema, initial encounter
- T78.40XAAllergy, unspecified, initial encounter
- T78.49XAOther allergy, initial encounter
- T80.51XAAnaphylactic reaction due to administration of blood and blood products, initial encounter
- T80.52XAAnaphylactic reaction due to vaccination, initial encounter
- T80.59XAAnaphylactic reaction due to other serum, initial encounter
- T80.61XAOther serum reaction due to administration of blood and blood products, initial encounter
- T80.62XAOther serum reaction due to vaccination, initial encounter
- T80.69XAOther serum reaction due to other serum, initial encounter
- T88.6XXAAnaphylactic reaction due to adverse effect of correct drug or medicament properly administered, initial encounter
Common questions about DRG 915
What is the relative weight of DRG 915?
- 1.6558 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 915?
- The geometric mean length of stay is 3.4 days; the arithmetic mean is 4.7 days.
Is DRG 915 medical or surgical?
- DRG 915 is a medical DRG.