A patient is admitted with fever, productive cough, and hypotension.

When sepsis due to a localized infection is responsible for the admission, the systemic infection is generally sequenced first, followed by the localized infection. If acute organ dysfunction is documented as associated with the sepsis, severe sepsis coding additionally requires the appropriate R65.2- code and code(s) for the acute organ dysfunction.

The severe-sepsis code itself is not sequenced as principal diagnosis. The underlying systemic infection precedes it. In this case, the patient's AKI has specifically been linked to sepsis, supporting the severe-sepsis framework.

Pneumonia remains important because it identifies the localized source of infection, but it does not generally precede the systemic infection when sepsis is present on admission and is responsible for the hospitalization.

The CDI specialist should verify that the documentation clearly establishes the relationship between the acute organ dysfunction and sepsis. Organ dysfunction occurring in a patient with sepsis is not automatically attributable to sepsis when another cause is documented or clinically plausible.

The FY 2026 ICD-10-CM Official Guidelines govern these sequencing principles.

CCDS Reference Topics: Sepsis; severe sepsis; principal diagnosis; acute organ dysfunction; sequencing.

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