Skip to main content

B18 vs Z22

B18 (Chronic viral hepatitis) compared with Z22 (Carrier of infectious disease), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. Z22 carries an Excludes2 note covering B18: “carrier of viral hepatitis (B18.-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

B18Chronic viral hepatitisZ22Carrier of infectious disease
Billing statusNon-billable header

Report instead: B18.0, B18.1, B18.2, B18.8, B18.9

Non-billable header

Report instead: Z22.0, Z22.1, Z22.2, Z22.31, Z22.321

ClassificationA00-B99 — Certain Infectious and Parasitic Diseases (A00-B99)Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99)
DefinitionChronic viral hepatitis is a non-billable ICD-10-CM category code (B18).Carrier of infectious disease is a non-billable ICD-10-CM category code (Z22).
Includes
Carrier of viral hepatitis
colonization status
suspected carrier
Use additional code
code, if applicable, for ascites (R18.8)
—
Edit this comparisonCheck a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources