S20.342A (External constriction of left front wall of thorax, initial encounter) compared with S20.349A (External constriction of unspecified front wall of thorax, initial encounter), from the official CMS tabular data. S20.342A and S20.349A code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. S20.342A and S20.349A 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.
| S20.342AExternal constriction of left front wall of thorax, initial encounter | S20.349AExternal constriction of unspecified front wall of thorax, initial 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 | External constriction of left front wall of thorax, initial encounter is a billable ICD-10-CM diagnosis code (S20.342A). | External constriction of unspecified front wall of thorax, initial encounter is a billable ICD-10-CM diagnosis code (S20.349A). |
| 7th character | The appropriate 7th character is to be added to each code from category S20 | The appropriate 7th character is to be added to each code from category S20 |
| 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