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  3. Diagnosis Codes in MS-DRG 915 - Allergic Reactions With MCC

Diagnosis Codes in MS-DRG 915 - Allergic Reactions With MCC

The Medicare Severity Diagnosis-Related Group (MS-DRG) is a patient classification system used to categorize hospital cases based on clinical similarity and expected resource use. MS-DRGs organize all possible principal diagnoses into mutually exclusive groups known as Major Diagnostic Categories (MDCs), which help determine reimbursement under the Medicare Inpatient Prospective Payment System.

This section lists the diagnosis codes included in MS-DRG V42.0: Allergic Reactions with MCC from October 1, 2024, through September 30, 2025.

MS-DRG: 915

MS-DRG Title: Allergic Reactions with MCC

MCD: 21

Relative Weight: 1.7378 Relative Weight
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Geometric LOS: 1.74 Geometric Length of Stay
The geometric mean length of stay (GMLOS) is used by Medicare to calculate the reimbursement for patients whose medical treatment takes a much longer or shorter time than average.

Arithmetic LOS: 3.70 Arithmetic Length of Stay
The average length of stay (ALOS) reflects the average number of days a patient spends in a hospital for each admission.

  • T78.00 - Anaphylactic reaction due to unspecified food

    • T78.00XA - Anaphylactic reaction due to unspecified food, initial encounter

  • T78.01 - Anaphylactic reaction due to peanuts

    • T78.01XA - Anaphylactic reaction due to peanuts, initial encounter

  • T78.02 - Anaphylactic reaction due to shellfish (crustaceans)

    • T78.02XA - Anaphylactic reaction due to shellfish (crustaceans), initial encounter

  • T78.03 - Anaphylactic reaction due to other fish

    • T78.03XA - Anaphylactic reaction due to other fish, initial encounter

  • T78.04 - Anaphylactic reaction due to fruits and vegetables

    • T78.04XA - Anaphylactic reaction due to fruits and vegetables, initial encounter

  • T78.05 - Anaphylactic reaction due to tree nuts and seeds

    • T78.05XA - Anaphylactic reaction due to tree nuts and seeds, initial encounter

  • T78.06 - Anaphylactic reaction due to food additives

    • T78.06XA - Anaphylactic reaction due to food additives, initial encounter

  • T78.07 - Anaphylactic reaction due to milk and dairy products

    • T78.07XA - Anaphylactic reaction due to milk and dairy products, initial encounter

  • T78.08 - Anaphylactic reaction due to eggs

    • T78.08XA - Anaphylactic reaction due to eggs, initial encounter

  • T78.09 - Anaphylactic reaction due to other food products

    • T78.09XA - Anaphylactic reaction due to other food products, initial encounter

  • T78.2 - Anaphylactic shock, unspecified

    • T78.2XXA - Anaphylactic shock, unspecified, initial encounter

  • T78.3 - Angioneurotic edema

    • T78.3XXA - Angioneurotic edema, initial encounter

  • T78.40 - Allergy, unspecified

    • T78.40XA - Allergy, unspecified, initial encounter

  • T78.49 - Other allergy

    • T78.49XA - Other allergy, initial encounter

  • T80.51 - Anaphylactic reaction due to administration of blood and blood products

    • T80.51XA - Anaphylactic reaction due to administration of blood and blood products, initial encounter

  • T80.52 - Anaphylactic reaction due to vaccination

    • T80.52XA - Anaphylactic reaction due to vaccination, initial encounter

  • T80.59 - Anaphylactic reaction due to other serum

    • T80.59XA - Anaphylactic reaction due to other serum, initial encounter

  • T80.61 - Other serum reaction due to administration of blood and blood products

    • T80.61XA - Other serum reaction due to administration of blood and blood products, initial encounter

  • T80.62 - Other serum reaction due to vaccination

    • T80.62XA - Other serum reaction due to vaccination, initial encounter

  • T80.69 - Other serum reaction due to other serum

    • T80.69XA - Other serum reaction due to other serum, initial encounter

  • T88.6 - Anaphylactic reaction due to adverse effect of correct drug or medicament properly administered

    • T88.6XXA - Anaphylactic reaction due to adverse effect of correct drug or medicament properly administered, initial encounter