Chapter 1

A00–B99: Certain Infectious and Parasitic Diseases

Certain Infectious and Parasitic Diseases diagnostic classification updated for 2026.

Chapter Instructions

Includes

diseases generally recognized as communicable or transmissible

Excludes1(Not coded here. Use a different code.)

certain localized infections - see body system-related chapters

Excludes2(Not included here. Code separately if applicable.)

carrier or suspected carrier of infectious disease (Z22.-)
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
infectious and parasitic diseases specific to the perinatal period (P35-P39)
influenza and other acute respiratory infections (J00-J22)

Use Additional Code

code to identify resistance to antimicrobial drugs (Z16.-)

All Codes Billable Only

Internal Codes

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B97.5|
Reovirus as the cause of diseases classified elsewhere
B97.6|
Parvovirus as the cause of diseases classified elsewhere
B97.7|
Papillomavirus as the cause of diseases classified elsewhere
B97.8|
Other viral agents as the cause of diseases classified elsewhere
B97.81|
Human metapneumovirus as the cause of diseases classified elsewhere
B97.89|
Other viral agents as the cause of diseases classified elsewhere
B99|
Other and unspecified infectious diseases
B99.8|
Other infectious disease
B99.9|
Unspecified infectious disease

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