B99.9

Billable

Unspecified infectious disease

B99.9 is the ICD-10-CM code for Unspecified infectious disease. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
A00-B99
Parent
B99
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

What are infectious diseases? Germs, or microbes, are found everywhere - in the air, soil, and water. There are also germs on your skin and in your body. Many of them are harmless, and some can even be helpful. But some of them can make you sick. Infectious diseases are diseases that are caused by germs. What are the different types of germs that cause infectious diseases? There are four main types of germs:…

Read more about Infectious Diseases at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

No additional coding notes for this code.

Conditions mapped to this code

MedlinePlus · NIH

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

Frequently asked questions

What is ICD-10 code B99.9?
B99.9 is the ICD-10-CM code for "Unspecified infectious disease". It falls under A00-B99 Certain infectious and parasitic diseases.
Is B99.9 a billable code?
Yes — B99.9 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

Look up another ICD-10 code or condition

Powered by Eleplan

Free ICD-10 lookup is just the start. Eleplan keeps the whole care plan in one place.

Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, with Ellie, your AI care assistant, on top of it. Free to start.