B99.9: Unspecified infectious disease
B99.9 is the billable ICD-10-CM diagnosis code for Unspecified infectious disease. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code B99.9?
B99.9 is the ICD-10-CM diagnosis code for Unspecified infectious disease. It belongs to category B99 (Other and unspecified infectious diseases).
Is B99.9 a billable code?
Yes. B99.9 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does B99.9 belong to?
B99.9 is part of ICD-10-CM category B99 — Other and unspecified infectious diseases, which has 4 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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