Pyrexia of unknown origin following delivery

This code signifies a fever of undetermined origin that develops in a patient during the postpartum period. It indicates a systemic inflammatory response without an identified source, occurring after childbirth.

Assign this code when a patient presents with a fever following delivery, and despite investigation, the underlying cause remains unknown. Documentation should clearly state "pyrexia of unknown origin" or "fever of unknown origin" in the postpartum context.

• Ensure the documentation specifies "unknown origin" to differentiate from fevers with an identified cause.
• Verify the fever occurred after delivery; fevers during labor are coded differently.
• Always sequence this code after any definitive diagnosis if one is eventually identified.