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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B05.8|
Measles with other complications
B05.81|
Measles keratitis and keratoconjunctivitis
B05.89|
Other measles complications
B05.9|
Measles without complication
B06|
Rubella [German measles]
B06.0|
Rubella with neurological complications
B06.00|
Rubella with neurological complication, unspecified
B06.01|
Rubella encephalitis
B06.02|
Rubella meningitis
B06.09|
Other neurological complications of rubella
B06.8|
Rubella with other complications
B06.81|
Rubella pneumonia
B06.82|
Rubella arthritis
B06.89|
Other rubella complications
B06.9|
Rubella without complication
B07|
Viral warts
B07.0|
Plantar wart
B07.8|
Other viral warts
B07.9|
Viral wart, unspecified
B08|
Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified
B08.0|
Other orthopoxvirus infections
B08.01|
Cowpox and vaccinia not from vaccine
B08.010|
Cowpox
B08.011|
Vaccinia not from vaccine
B08.02|
Orf virus disease
B08.03|
Pseudocowpox [milker's node]
B08.04|
Paravaccinia, unspecified
B08.09|
Other orthopoxvirus infections
B08.1|
Molluscum contagiosum
B08.2|
Exanthema subitum [sixth disease]
B08.20|
Exanthema subitum [sixth disease], unspecified
B08.21|
Exanthema subitum [sixth disease] due to human herpesvirus 6
B08.22|
Exanthema subitum [sixth disease] due to human herpesvirus 7
B08.3|
Erythema infectiosum [fifth disease]
B08.4|
Enteroviral vesicular stomatitis with exanthem
B08.5|
Enteroviral vesicular pharyngitis
B08.6|
Parapoxvirus infections
B08.60|
Parapoxvirus infection, unspecified
B08.61|
Bovine stomatitis
B08.62|
Sealpox
B08.69|
Other parapoxvirus infections
B08.7|
Yatapoxvirus infections
B08.70|
Yatapoxvirus infection, unspecified
B08.71|
Tanapox virus disease
B08.72|
Yaba pox virus disease
B08.79|
Other yatapoxvirus infections
B08.8|
Other specified viral infections characterized by skin and mucous membrane lesions
B09|
Unspecified viral infection characterized by skin and mucous membrane lesions
B10|
Other human herpesviruses
B10.0|
Other human herpesvirus encephalitis

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