Sequelae of unspecified infectious and parasitic disease

This code signifies a condition or symptom that is a residual effect or late manifestation of a past infectious or parasitic disease, where the specific original infection is not documented or is unknown. It represents a long-term health problem directly attributable to a resolved infectious process.

Apply this code when documentation clearly links a current condition to a previous infectious or parasitic illness, but the specific pathogen or disease is not identified. This is appropriate for chronic sequelae where the acute infection has passed and the current issue is a lasting consequence.

• Do not use this code if the specific infectious or parasitic disease causing the sequela is known; instead, code the specific sequela and the specific infectious disease.
• Always sequence the code for the specific sequela (e.g., chronic fatigue, organ damage) first, followed by this code to indicate its infectious origin.
• Carefully review documentation to ensure the sequela is not a post COVID-19 condition, which has a specific exclusion and dedicated code (U09.9).