ICD-10 Code B99.8 – Other infectious disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B99.8 – Other infectious disease
What it is
B99.8 is used for an infectious disease that is documented but does not fit a more specific ICD-10 category. It is a residual code for other identified infections.
Clinical signs
Clinical features vary; refer to documentation. You may see signs of infection such as fever, localized inflammation, or organism-specific findings, but the chart should identify the infection clearly enough to support this code.
When to use this code
Use B99.8 when the provider documents a specific infectious disease that has no dedicated ICD-10 code or is otherwise classified as “other.” It may also fit when the infection is identified, but the record does not support a more precise code. Check documentation for the organism, site, and any linked condition.
Do not use for
Do not use this code for unspecified infection, suspected infection, or conditions with a more exact ICD-10 code. If the documentation supports a different infectious category, code that diagnosis instead.
Coding tip
Before assigning B99.8, confirm that the infection is clearly documented and that no more specific code is available.