Nocardiosis (A43) ICD-10-CM
The A43 code range covers nocardiosis with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the A43 Range 5 codes · 4 billable
About the A43 Code Range
ICD-10 code A43 is used to classify infections caused by the Nocardia bacteria, known collectively as nocardiosis. This group of codes specifies different forms of nocardiosis, including infections affecting the lungs, skin, and other parts of the body.
More specifically, A43.0 refers to pulmonary nocardiosis, also called nocardial pneumonia, which is a bacterial lung infection. A43.1 codes for cutaneous nocardiosis, involving skin and soft tissue infections, sometimes known as primary cutaneous nocardiosis or related actinomycetoma infections caused by various Nocardia species. Code A43.8 captures other forms of nocardiosis, such as abdominal abscesses or infections of the brain like meningitis or encephalitis. Finally, A43.9 is for unspecified nocardiosis cases, including infections that occur alongside immunodeficiency conditions like AIDS. Using these codes helps healthcare providers accurately identify and document the specific site and nature of nocardiosis infection for diagnosis and treatment.
Questions About This Page
How many billable codes are in the A43 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the A43 range classify?
The range classifies nocardiosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
