Other infectious diseases (B99) ICD-10-CM
The B99 section covers other infectious diseases with 3 ICD-10-CM diagnosis codes, of which 2 are billable in fiscal year 2026. The section is organized into the 1 code ranges listed below.
Code Ranges in This Section 1 ranges · 3 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| B99 | Other and unspecified infectious diseases (B99) | 3 | 2 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the B99 Code Range
The ICD-10 code range B99 covers other and unspecified infectious diseases that do not fit into more specific categories. It includes conditions caused by unusual infectious agents such as Protothecosis and infections related to medical devices or implants.
This range is used for coding infections that are either unspecified or caused by rare or less common organisms, like algae or plant pathogens, as seen in B99.8. The codes also capture a vast array of infectious complications involving skin, soft tissue, bone, nervous system, and various medical devices. The B99.9 code represents unspecified infectious diseases and includes many synonyms like localized infections, paronychia, abscesses, osteomyelitis, and infections of implantable devices, catheters, and prostheses. This code is essential for documenting infections where the exact cause or specific infectious agent is unknown or not further classified. Medical coders use these codes to report infections associated with diverse body systems and complications from indwelling devices or surgical procedures, helping in the identification and management of uncommon or secondary infections in clinical practice.
Questions About This Page
How many codes are in the B99 range?
The B99 range contains 3 ICD-10-CM diagnosis codes in FY 2026. 2 of them are billable, and the rest are category headers that organize the section.
What conditions does B99 cover?
The range covers other infectious 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.
