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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B34.2|
Coronavirus infection, unspecified
B34.3|
Parvovirus infection, unspecified
B34.4|
Papovavirus infection, unspecified
B34.8|
Other viral infections of unspecified site
B34.9|
Viral infection, unspecified
B35|
Dermatophytosis
B35.0|
Tinea barbae and tinea capitis
B35.1|
Tinea unguium
B35.2|
Tinea manuum
B35.3|
Tinea pedis
B35.4|
Tinea corporis
B35.5|
Tinea imbricata
B35.6|
Tinea cruris
B35.8|
Other dermatophytoses
B35.9|
Dermatophytosis, unspecified
B36|
Other superficial mycoses
B36.0|
Pityriasis versicolor
B36.1|
Tinea nigra
B36.2|
White piedra
B36.3|
Black piedra
B36.8|
Other specified superficial mycoses
B36.9|
Superficial mycosis, unspecified
B37|
Candidiasis
B37.0|
Candidal stomatitis
B37.1|
Pulmonary candidiasis
B37.2|
Candidiasis of skin and nail
B37.3|
Candidiasis of vulva and vagina
B37.31|
Acute candidiasis of vulva and vagina
B37.32|
Chronic candidiasis of vulva and vagina
B37.4|
Candidiasis of other urogenital sites
B37.41|
Candidal cystitis and urethritis
B37.42|
Candidal balanitis
B37.49|
Other urogenital candidiasis
B37.5|
Candidal meningitis
B37.6|
Candidal endocarditis
B37.7|
Candidal sepsis
B37.8|
Candidiasis of other sites
B37.81|
Candidal esophagitis
B37.82|
Candidal enteritis
B37.83|
Candidal cheilitis
B37.84|
Candidal otitis externa
B37.89|
Other sites of candidiasis
B37.9|
Candidiasis, unspecified
B38|
Coccidioidomycosis
B38.0|
Acute pulmonary coccidioidomycosis
B38.1|
Chronic pulmonary coccidioidomycosis
B38.2|
Pulmonary coccidioidomycosis, unspecified
B38.3|
Cutaneous coccidioidomycosis
B38.4|
Coccidioidomycosis meningitis
B38.7|
Disseminated coccidioidomycosis

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