B99Header code — not billable
Other and unspecified infectious diseases
- Chapter
- 1. Certain infectious and parasitic diseases
- Category
- B99
- Effective date
- October 1, 2026
Related codes in category B99
Frequently asked questions
What is ICD-10 code B99?
B99 is an ICD-10-CM diagnosis code for Other and unspecified infectious diseases.
Is B99 a billable code?
No. B99 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is B99 in?
B99 falls under Chapter 1: Certain infectious and parasitic diseases.
When did B99 become effective?
B99 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to B99?
B99 belongs to category B99, which includes 2 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.