S21.421D vs S21.422D
S21.421D (Laceration with foreign body of right back wall of thorax with penetration into thoracic cavity, subsequent encounter) compared with S21.422D (Laceration with foreign body of left back wall of thorax with penetration into thoracic cavity, subsequent encounter), from the official CMS tabular data. S21.421D and S21.422D code the same condition on opposite sides.
Can these codes be reported together?
Same condition, opposite side. S21.421D and S21.422D name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
Side by side
| S21.421DLaceration with foreign body of right back wall of thorax with penetration into thoracic cavity, subsequent encounter | S21.422DLaceration with foreign body of left back wall of thorax with penetration into thoracic cavity, subsequent encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Laceration with foreign body of right back wall of thorax with penetration into thoracic cavity, subsequent encounter is a billable ICD-10-CM diagnosis code (S21.421D). | Laceration with foreign body of left back wall of thorax with penetration into thoracic cavity, subsequent encounter is a billable ICD-10-CM diagnosis code (S21.422D). |
| 7th character | The appropriate 7th character is to be added to each code from category S21 | The appropriate 7th character is to be added to each code from category S21 |
| Includes | injuries of breast injuries of chest (wall) injuries of interscapular area | injuries of breast injuries of chest (wall) injuries of interscapular area |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources