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ICD11

Certain infectious or parasitic diseases (A00–B99)

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Certain infectious or parasitic diseases is a chapter in ICD-11 that covers conditions caused by pathogenic microorganisms such as bacteria, viruses, fungi, parasites, and other infectious agents. These diseases arise when such organisms enter the human body, multiply, and disrupt normal physiological functions, leading to localized or systemic illness. The chapter includes a wide range of conditions, from common and self-limiting infections to severe, life-threatening diseases, and accounts for both acute and chronic infections that may affect individuals of all ages.

This chapter also addresses infectious and parasitic diseases based on their mode of transmission, clinical presentation, and etiological agents. It includes illnesses spread through direct contact, airborne routes, contaminated food or water, vectors such as insects, and zoonotic sources. Accurate classification within this chapter supports disease surveillance, outbreak control, treatment planning, and public health interventions, making it essential for monitoring global health trends and guiding preventive and therapeutic strategies.

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Frequently asked questions

This chapter includes diseases caused by pathogenic organisms such as bacteria, viruses, fungi, parasites, and other infectious agents. It focuses on conditions that are transmissible or directly result from infection.

It includes a broad range of infections such as respiratory, gastrointestinal, blood-borne, vector-borne, and systemic infections, including both common and rare diseases.

Yes. ICD-11 is designed to accommodate emerging and re-emerging infectious diseases, allowing timely updates as new pathogens are identified.

ICD-11 offers improved structure, updated terminology, and greater flexibility to capture causative agents, resistance patterns, and clinical context.

Primary infectious conditions are coded here, while complications may be coded separately depending on their nature and clinical significance.

Accurate coding supports disease surveillance, outbreak management, antimicrobial stewardship, public health reporting, and global health monitoring.

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