S90.542S (External constriction, left ankle, sequela) compared with S90.549S (External constriction, unspecified ankle, sequela), from the official CMS tabular data. S90.542S and S90.549S 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. S90.542S and S90.549S 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.
| S90.542SExternal constriction, left ankle, sequela | S90.549SExternal constriction, unspecified ankle, 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 | External constriction, left ankle, sequela is a billable ICD-10-CM diagnosis code (S90.542S). | External constriction, unspecified ankle, sequela is a billable ICD-10-CM diagnosis code (S90.549S). |
| 7th character | The appropriate 7th character is to be added to each code from category S90 | The appropriate 7th character is to be added to each code from category S90 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources