Allergic Reactions with MCC
Major Diagnostic Category 21·Grouped by diagnosis·FY 2027
MS-DRG 915 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 21 (MDC 21) with a Major Complication or Comorbidity (MCC). It maps to 25 ICD-10-CM diagnosis codes. For FY 2027 it carries a relative weight of 1.6558 with a geometric mean length of stay of 3.4 days and an arithmetic mean of 4.7 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.
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FY 2027 payment data
From Table 5 of the FY 2027 IPPS Final Rule (CMS).
- Relative weight:
- 1.6558 (payment multiplier vs. the average case (1.0))
- Geometric mean stay:
- 3.4 days (used for transfer payments)
- Average stay:
- 4.7 days (arithmetic mean)
- Post-acute transfer policy:
- No (not subject to it)
Same condition, other severity levels
CMS splits one condition into separate DRGs by how sick the patient is. With MCC pays more than with CC, which pays more than without CC/MCC.
| DRG | Title | Relative weight | Mean stay |
|---|---|---|---|
| 915 | Allergic Reactions with MCC (this page) | 1.6558 | 3.4 days |
| 916 | Allergic Reactions without MCC | 0.6928 | 1.8 days |
Diagnosis codes (25)
As the principal diagnosis, these ICD-10-CM codes can group to DRG 915. 100% of the codes listed are billable.
- 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