Z03.822 vs Z18
Z03.822 (Encounter for observation for suspected aspirated (inhaled) foreign body ruled out) compared with Z18 (Retained foreign body fragments), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. Z03.822 carries an Excludes1 note covering Z18: “retained foreign body (Z18.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| Z03.822Encounter for observation for suspected aspirated (inhaled) foreign body ruled out | Z18Retained foreign body fragments | |
|---|---|---|
| Billing status | Billable | 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 | Encounter for observation for suspected aspirated (inhaled) foreign body ruled out is a billable ICD-10-CM diagnosis code (Z03.822). | 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 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources