Other bacterial diseases (A30-A49) ICD-10-CM
The A30–A49 section covers other bacterial diseases with 144 ICD-10-CM diagnosis codes, of which 115 are billable in fiscal year 2026. The section is organized into the 18 code ranges listed below.
Code Ranges in This Section 18 ranges · 144 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the A30–A49 Code Range
ICD-10 codes A30-A49 classify a range of other bacterial diseases caused by various bacteria including mycobacteria, Listeria, and staphylococci. These codes are used to specify infections like leprosy, listeriosis, tetanus, diphtheria, whooping cough, and diverse sepsis cases, helping to accurately identify and document these distinct bacterial conditions for clinical and coding purposes.
This code chapter covers diseases such as leprosy (A30), including types like tuberculoid and lepromatous leprosy; infections by other mycobacteria (A31) including pulmonary and cutaneous forms; and listeriosis (A32), with manifestations like meningitis and sepsis. It also details tetanus (A33-A35), categorized by neonatal, obstetrical, and other forms. Diphtheria codes (A36) address pharyngeal and cutaneous infections along with related complications. The range continues with whooping cough (A37) due to various Bordetella species and scarlet fever (A38). Additionally, meningococcal infections (A39), streptococcal and staphylococcal sepsis (A40-A41), and other serious bacterial diseases like actinomycosis, nocardiosis, bartonellosis, erysipelas, legionnaires' disease, and toxic shock syndrome are included. The codes also cover unspecified bacterial infections (A49) for unclear site or organism, aiding precision in medical documentation and billing.
Questions About This Page
How many codes are in the A30-A49 range?
The A30-A49 range contains 144 ICD-10-CM diagnosis codes in FY 2026. 115 of them are billable, and the rest are category headers that organize the section.
What conditions does A30-A49 cover?
The range covers other bacterial diseases. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
