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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A15.8|
Other respiratory tuberculosis
A15.9|
Respiratory tuberculosis unspecified
A17|
Tuberculosis of nervous system
A17.0|
Tuberculous meningitis
A17.1|
Meningeal tuberculoma
A17.8|
Other tuberculosis of nervous system
A17.81|
Tuberculoma of brain and spinal cord
A17.82|
Tuberculous meningoencephalitis
A17.83|
Tuberculous neuritis
A17.89|
Other tuberculosis of nervous system
A17.9|
Tuberculosis of nervous system, unspecified
A18|
Tuberculosis of other organs
A18.0|
Tuberculosis of bones and joints
A18.01|
Tuberculosis of spine
A18.02|
Tuberculous arthritis of other joints
A18.03|
Tuberculosis of other bones
A18.09|
Other musculoskeletal tuberculosis
A18.1|
Tuberculosis of genitourinary system
A18.10|
Tuberculosis of genitourinary system, unspecified
A18.11|
Tuberculosis of kidney and ureter
A18.12|
Tuberculosis of bladder
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
A18.3|
Tuberculosis of intestines, peritoneum and mesenteric glands
A18.31|
Tuberculous peritonitis
A18.32|
Tuberculous enteritis
A18.39|
Retroperitoneal tuberculosis
A18.4|
Tuberculosis of skin and subcutaneous tissue
A18.5|
Tuberculosis of eye
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
A18.8|
Tuberculosis of other specified organs
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|
Miliary tuberculosis

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