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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B65.0|
Schistosomiasis due to Schistosoma haematobium [urinary schistosomiasis]
B65.1|
Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]
B65.2|
Schistosomiasis due to Schistosoma japonicum
B65.3|
Cercarial dermatitis
B65.8|
Other schistosomiasis
B65.9|
Schistosomiasis, unspecified
B66.0|
Opisthorchiasis
B66.1|
Clonorchiasis
B66.2|
Dicroceliasis
B66.3|
Fascioliasis
B66.4|
Paragonimiasis
B66.5|
Fasciolopsiasis
B66.8|
Other specified fluke infections
B66.9|
Fluke infection, unspecified
B67.0|
Echinococcus granulosus infection of liver
B67.1|
Echinococcus granulosus infection of lung
B67.2|
Echinococcus granulosus infection of bone
B67.31|
Echinococcus granulosus infection, thyroid gland
B67.32|
Echinococcus granulosus infection, multiple sites
B67.39|
Echinococcus granulosus infection, other sites
B67.4|
Echinococcus granulosus infection, unspecified
B67.5|
Echinococcus multilocularis infection of liver
B67.61|
Echinococcus multilocularis infection, multiple sites
B67.69|
Echinococcus multilocularis infection, other sites
B67.7|
Echinococcus multilocularis infection, unspecified
B67.8|
Echinococcosis, unspecified, of liver
B67.90|
Echinococcosis, unspecified
B67.99|
Other echinococcosis
B68.0|
Taenia solium taeniasis
B68.1|
Taenia saginata taeniasis
B68.9|
Taeniasis, unspecified
B69.0|
Cysticercosis of central nervous system
B69.1|
Cysticercosis of eye
B69.81|
Myositis in cysticercosis
B69.89|
Cysticercosis of other sites
B69.9|
Cysticercosis, unspecified
B70.0|
Diphyllobothriasis
B70.1|
Sparganosis
B71.0|
Hymenolepiasis
B71.1|
Dipylidiasis
B71.8|
Other specified cestode infections
B71.9|
Cestode infection, unspecified
B72|
Dracunculiasis
B73.00|
Onchocerciasis with eye involvement, unspecified
B73.01|
Onchocerciasis with endophthalmitis
B73.02|
Onchocerciasis with glaucoma
B73.09|
Onchocerciasis with other eye involvement
B73.1|
Onchocerciasis without eye disease
B74.0|
Filariasis due to Wuchereria bancrofti
B74.1|
Filariasis due to Brugia malayi

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