Other and unspecified infectious diseases (B99) ICD-10-CM
The B99 code range covers other and unspecified infectious diseases with 3 ICD-10-CM diagnosis codes. 2 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the B99 Range 3 codes · 2 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B99 range.
Infections
Invasion of the host organism by microorganisms or their toxins or by parasites that can cause pathological conditions or diseases.
About the B99 Code Range
Some infectious diseases are listed as other infectious diseases, while others have no specified type. The subdivisions separate other infectious disease (B99.8) from unspecified infectious disease (B99.9).
Questions About This Page
How many billable codes are in the B99 range?
Of the 3 codes in this range, 2 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the B99 range classify?
The range classifies other and unspecified infectious diseases. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
