Z18 vs Z77.4
Z18 (Retained foreign body fragments) compared with Z77.4 (Contact with and (suspected) exposure to blast overpressure), 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. Z77.4 carries an Excludes2 note covering Z18: “retained foreign body (Z18.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| Z18Retained foreign body fragments | Z77.4Contact with and (suspected) exposure to blast overpressure | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Retained foreign body fragments is a non-billable ICD-10-CM category code (Z18). | — |
| Includes | embedded fragment (status) embedded splinter (status) retained foreign body status | contact with and (suspected) exposures to potential hazards to health |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources