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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A18.13|
Tuberculosis of other urinary organs
A18.14|
Tuberculosis of prostate
A18.15|
Tuberculosis of other male genital organs
A18.16|
Tuberculosis of cervix
A18.17|
Tuberculous female pelvic inflammatory disease
A18.18|
Tuberculosis of other female genital organs
A18.2|
Tuberculous peripheral lymphadenopathy
A18.31|
Tuberculous peritonitis
A18.32|
Tuberculous enteritis
A18.39|
Retroperitoneal tuberculosis
A18.4|
Tuberculosis of skin and subcutaneous tissue
A18.50|
Tuberculosis of eye, unspecified
A18.51|
Tuberculous episcleritis
A18.52|
Tuberculous keratitis
A18.53|
Tuberculous chorioretinitis
A18.54|
Tuberculous iridocyclitis
A18.59|
Other tuberculosis of eye
A18.6|
Tuberculosis of (inner) (middle) ear
A18.7|
Tuberculosis of adrenal glands
A18.81|
Tuberculosis of thyroid gland
A18.82|
Tuberculosis of other endocrine glands
A18.83|
Tuberculosis of digestive tract organs, not elsewhere classified
A18.84|
Tuberculosis of heart
A18.85|
Tuberculosis of spleen
A18.89|
Tuberculosis of other sites
A19.0|
Acute miliary tuberculosis of a single specified site
A19.1|
Acute miliary tuberculosis of multiple sites
A19.2|
Acute miliary tuberculosis, unspecified
A19.8|
Other miliary tuberculosis
A19.9|
Miliary tuberculosis, unspecified
A20.0|
Bubonic plague
A20.1|
Cellulocutaneous plague
A20.2|
Pneumonic plague
A20.3|
Plague meningitis
A20.7|
Septicemic plague
A20.8|
Other forms of plague
A20.9|
Plague, unspecified
A21.0|
Ulceroglandular tularemia
A21.1|
Oculoglandular tularemia
A21.2|
Pulmonary tularemia
A21.3|
Gastrointestinal tularemia
A21.7|
Generalized tularemia
A21.8|
Other forms of tularemia
A21.9|
Tularemia, unspecified
A22.0|
Cutaneous anthrax
A22.1|
Pulmonary anthrax
A22.2|
Gastrointestinal anthrax
A22.7|
Anthrax sepsis
A22.8|
Other forms of anthrax
A22.9|
Anthrax, unspecified

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