| Z18 | Retained foreign body fragments | NON-BILLABLE CODE |
| Z18.0 | Retained radioactive fragments | NON-BILLABLE CODE |
| Z18.01 | Retained depleted uranium fragments | BILLABLE CODE |
| Z18.09 | Other retained radioactive fragments | BILLABLE CODE |
| Z18.1 | Retained metal fragments | NON-BILLABLE CODE |
| Z18.10 | Retained metal fragments, unspecified | BILLABLE CODE |
| Z18.11 | Retained magnetic metal fragments | BILLABLE CODE |
| Z18.12 | Retained nonmagnetic metal fragments | BILLABLE CODE |
| Z18.2 | Retained plastic fragments | BILLABLE CODE |
| Z18.3 | Retained organic fragments | NON-BILLABLE CODE |
| Z18.31 | Retained animal quills or spines | BILLABLE CODE |
| Z18.32 | Retained tooth | BILLABLE CODE |
| Z18.33 | Retained wood fragments | BILLABLE CODE |
| Z18.39 | Other retained organic fragments | BILLABLE CODE |
| Z18.8 | Other specified retained foreign body | NON-BILLABLE CODE |
| Z18.83 | Retained stone or crystalline fragments | BILLABLE CODE |
| Z18.89 | Other specified retained foreign body fragments | BILLABLE CODE |
| Z18.9 | Retained foreign body fragments, unspecified material | BILLABLE CODE |
