S21.401S vs S21.409S
S21.401S (Unspecified open wound of right back wall of thorax with penetration into thoracic cavity, sequela) compared with S21.409S (Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity, sequela), from the official CMS tabular data. S21.401S and S21.409S code the same condition on opposite sides.
Can these codes be reported together?
Same condition, opposite side. S21.401S and S21.409S 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
| S21.401SUnspecified open wound of right back wall of thorax with penetration into thoracic cavity, sequela | S21.409SUnspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity, sequela | |
|---|---|---|
| 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 | Unspecified open wound of right back wall of thorax with penetration into thoracic cavity, sequela is a billable ICD-10-CM diagnosis code (S21.401S). | Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity, sequela is a billable ICD-10-CM diagnosis code (S21.409S). |
| 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