All ICD10 Codes

DRG 916

Medical DRG

Allergic Reactions without MCC

TypeMedicalMDC21Dx Codes25

What is MS-DRG 916?

MS-DRG 916 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 21 (MDC 21) without a significant Complication or Comorbidity. It maps to 25 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 0.6663 with a geometric mean length of stay of 1.8 days and an arithmetic mean of 2.2 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

Classification
Medical DRG
Diagnosis-driven grouping
MDC
Major Diagnostic Category 21
Linked Codes
25 diagnosis
Billable Dx
100%
25 of 25 shown

FY 2026 Payment Data

Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).

Relative Weight
0.6663
Payment multiplier vs. average case (1.0)
Geometric Mean LOS
1.8 days
Used for transfer payment calculations
Arithmetic Mean LOS
2.2 days
Average length of stay
Post-Acute Transfer
No
Not subject to the transfer policy

Related MS-DRGs in This Severity Group

The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.

DRGTitleRel. WeightGMLOS
915Allergic Reactions with MCC1.68163.5 days
916Allergic Reactions without MCCThis page0.66631.8 days

Linked ICD-10-CM Diagnosis Mappings

  • T78.00XA

    Anaphylactic reaction due to unspecified food, initial encounter

    BillableChapter 19
  • T78.01XA

    Anaphylactic reaction due to peanuts, initial encounter

    BillableChapter 19
  • T78.02XA

    Anaphylactic reaction due to shellfish (crustaceans), initial encounter

    BillableChapter 19
  • T78.03XA

    Anaphylactic reaction due to other fish, initial encounter

    BillableChapter 19
  • T78.04XA

    Anaphylactic reaction due to fruits and vegetables, initial encounter

    BillableChapter 19
  • T78.05XA

    Anaphylactic reaction due to tree nuts and seeds, initial encounter

    BillableChapter 19
  • T78.06XA

    Anaphylactic reaction due to food additives, initial encounter

    BillableChapter 19
  • T78.070A

    Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter

    BillableChapter 19
  • T78.071A

    Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounter

    BillableChapter 19
  • T78.079A

    Anaphylactic reaction due to milk and dairy products, unspecified, initial encounter

    BillableChapter 19
  • T78.080A

    Anaphylactic reaction due to egg with tolerance to baked egg, initial encounter

    BillableChapter 19
  • T78.081A

    Anaphylactic reaction due to egg with reactivity to baked egg, initial encounter

    BillableChapter 19
  • T78.089A

    Anaphylactic reaction due to eggs, unspecified, initial encounter

    BillableChapter 19
  • T78.09XA

    Anaphylactic reaction due to other food products, initial encounter

    BillableChapter 19
  • T78.2XXA

    Anaphylactic shock, unspecified, initial encounter

    BillableChapter 19
  • T78.3XXA

    Angioneurotic edema, initial encounter

    BillableChapter 19
  • T78.40XA

    Allergy, unspecified, initial encounter

    BillableChapter 19
  • T78.49XA

    Other allergy, initial encounter

    BillableChapter 19
  • T80.51XA

    Anaphylactic reaction due to administration of blood and blood products, initial encounter

    BillableChapter 19
  • T80.52XA

    Anaphylactic reaction due to vaccination, initial encounter

    BillableChapter 19
  • T80.59XA

    Anaphylactic reaction due to other serum, initial encounter

    BillableChapter 19
  • T80.61XA

    Other serum reaction due to administration of blood and blood products, initial encounter

    BillableChapter 19
  • T80.62XA

    Other serum reaction due to vaccination, initial encounter

    BillableChapter 19
  • T80.69XA

    Other serum reaction due to other serum, initial encounter

    BillableChapter 19
  • T88.6XXA

    Anaphylactic reaction due to adverse effect of correct drug or medicament properly administered, initial encounter

    BillableChapter 19