B18Header code — not billable

Chronic viral hepatitis

Chapter
1. Certain infectious and parasitic diseases
Category
B18
Effective date
October 1, 2026

Related codes in category B18

B18.0Chronic viral hepatitis B with delta-agentYesB18.1Chronic viral hepatitis B without delta-agentYesB18.2Chronic viral hepatitis CYesB18.8Other chronic viral hepatitisYesB18.9Chronic viral hepatitis, unspecifiedYes

Frequently asked questions

What is ICD-10 code B18?

B18 is an ICD-10-CM diagnosis code for Chronic viral hepatitis.

Is B18 a billable code?

No. B18 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 B18 in?

B18 falls under Chapter 1: Certain infectious and parasitic diseases.

When did B18 become effective?

B18 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to B18?

B18 belongs to category B18, which includes 5 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.