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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B38.8|
Other forms of coccidioidomycosis
B38.81|
Prostatic coccidioidomycosis
B38.89|
Other forms of coccidioidomycosis
B38.9|
Coccidioidomycosis, unspecified
B39|
Histoplasmosis
B39.0|
Acute pulmonary histoplasmosis capsulati
B39.1|
Chronic pulmonary histoplasmosis capsulati
B39.2|
Pulmonary histoplasmosis capsulati, unspecified
B39.3|
Disseminated histoplasmosis capsulati
B39.4|
Histoplasmosis capsulati, unspecified
B39.5|
Histoplasmosis duboisii
B39.9|
Histoplasmosis, unspecified
B40|
Blastomycosis
B40.0|
Acute pulmonary blastomycosis
B40.1|
Chronic pulmonary blastomycosis
B40.2|
Pulmonary blastomycosis, unspecified
B40.3|
Cutaneous blastomycosis
B40.7|
Disseminated blastomycosis
B40.8|
Other forms of blastomycosis
B40.81|
Blastomycotic meningoencephalitis
B40.89|
Other forms of blastomycosis
B40.9|
Blastomycosis, unspecified
B41|
Paracoccidioidomycosis
B41.0|
Pulmonary paracoccidioidomycosis
B41.7|
Disseminated paracoccidioidomycosis
B41.8|
Other forms of paracoccidioidomycosis
B41.9|
Paracoccidioidomycosis, unspecified
B42|
Sporotrichosis
B42.0|
Pulmonary sporotrichosis
B42.1|
Lymphocutaneous sporotrichosis
B42.7|
Disseminated sporotrichosis
B42.8|
Other forms of sporotrichosis
B42.81|
Cerebral sporotrichosis
B42.82|
Sporotrichosis arthritis
B42.89|
Other forms of sporotrichosis
B42.9|
Sporotrichosis, unspecified
B43|
Chromomycosis and pheomycotic abscess
B43.0|
Cutaneous chromomycosis
B43.1|
Pheomycotic brain abscess
B43.2|
Subcutaneous pheomycotic abscess and cyst
B43.8|
Other forms of chromomycosis
B43.9|
Chromomycosis, unspecified
B44|
Aspergillosis
B44.0|
Invasive pulmonary aspergillosis
B44.1|
Other pulmonary aspergillosis
B44.2|
Tonsillar aspergillosis
B44.7|
Disseminated aspergillosis
B44.8|
Other forms of aspergillosis
B44.81|
Allergic bronchopulmonary aspergillosis
B44.89|
Other forms of aspergillosis

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