MS-DRG 915: ALLERGIC REACTIONS WITH MCC
MS-DRG 915 is allergic reactions with mcc, in MDC 21 (a medical DRG), at the with-MCC (major complication or comorbidity) level. Its FY2027 relative weight is 1.6558, so a case here pays more than the average Medicare inpatient stay (weight 1.0), with a geometric mean length of stay of 3.40 days. 25 ICD-10-CM principal diagnoses group into MS-DRGs 915–916 under the CMS definitions manual; the most-searched are listed below.
FY2027 payment factors
- Relative weight
- 1.6558
- Geometric mean LOS
- 3.40
- Arithmetic mean LOS
- 4.70
- Post-acute transfer
- No
Principal diagnoses that group to MS-DRGs 915–916
From the CMS MS-DRG definitions manual’s principal-diagnosis index: 25 ICD-10-CM codes route here, and the CC/MCC status of the secondary diagnoses decides which of 915–916 the case lands in. The 24 most-searched:
- T78.40XAAllergy, unspecified, initial encounter
- T78.3XXAAngioneurotic edema, initial encounter
- T78.2XXAAnaphylactic shock, unspecified, initial encounter
- 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
- T78.49XAOther 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
1 more codes group here. Open any code above for its full hierarchy, or check a whole claim in the free DRG calculator.
The severity splits
Same base DRG, split by whether a secondary diagnosis is a CC or MCC. The last column is the weight change from MS-DRG 915.
| 915 | ALLERGIC REACTIONS WITH MCC | 1.6558 | |
| 916 | ALLERGIC REACTIONS WITHOUT MCC | 0.6928 | -0.9630 |
All FY2027 MS-DRGs · MDC 21