915 MS-DRG: ALLERGIC REACTIONS WITH MCC
MS-DRG 915 groups Medicare inpatient hospital stays for: ALLERGIC REACTIONS WITH MCC. This is a medical MS-DRG. It falls under MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 21 — Injuries, Poisonings and Toxic Effects of Drugs |
| DRG Type | Medical |
| Severity Level | MCC |
| Relative Weight | 1.6558 |
| Relative Weight (10% Cap Applied) | 1.6558 |
| Geometric Mean Length of Stay | 3.4 days |
| Arithmetic Mean Length of Stay | 4.7 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
25 diagnosis codes can drive assignment here: T78.00XA, T78.01XA, T78.02XA, T78.03XA, T78.04XA, T78.05XA, T78.06XA, T78.070A, T78.071A, T78.079A, T78.080A, T78.081A and 13 more.
From the CMS MS-DRG Definitions Manual (Appendices B and E). Assignment also depends on severity, discharge status and the rest of the claim.
Contextual Map
Every relationship of 915 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Major Diagnostic Category
- MDC 21 — Injuries, Poisonings and Toxic Effects of Drugs[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (25)
- T78.00XA — Anaphylactic reaction due to unspecified food, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T78.01XA — Anaphylactic reaction due to peanuts, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T78.02XA — Anaphylactic reaction due to shellfish (crustaceans), initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T78.03XA — Anaphylactic reaction due to other fish, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T78.04XA — Anaphylactic reaction due to fruits and vegetables, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T78.05XA — Anaphylactic reaction due to tree nuts and seeds, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T78.06XA — Anaphylactic reaction due to food additives, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T78.070A — Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 17 more
DRG family
- DRG 916 — ALLERGIC REACTIONS WITHOUT MCC[DRG family]: “ALLERGIC REACTIONS WITHOUT MCC — same CMS DRG family (915-916), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 915-916) · FY2027
Read from: CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44. All data sources · How to read the labels · How MedCoder verifies its implementation
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources