What Is the Plural of Diagnosis? | Spelling & Examples

Published on September 23, 2024 by Ryan Cove. Revised on February 6, 2025.

The plural of “diagnosis” is “diagnoses,” pronounced [dahy-uhg-noh-seez]. Because diagnosis is a Greek-origin noun, it follows Greek pluralization rules that change “-is” to “-es.”

Diagnoses examples
Over the years, her medical record contained multiple diagnoses of migraines.

The medical student learned that certain symptoms could lead to different diagnoses depending on the patient’s history.

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