S86.991 (Other injury of unspecified muscle(s) and tendon(s) at lower leg level, right leg) compared with S86.999 (Other injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg), from the official CMS tabular data. S86.991 and S86.999 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. S86.991 and S86.999 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.
| S86.991Other injury of unspecified muscle(s) and tendon(s) at lower leg level, right leg | S86.999Other injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| 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 | Other injury of unspecified muscle(s) and tendon(s) at lower leg level, right leg is a non-billable ICD-10-CM category code (S86.991). | Other injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg is a non-billable ICD-10-CM category code (S86.999). |
| 7th character | The appropriate 7th character is to be added to each code from category S86 | The appropriate 7th character is to be added to each code from category S86 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources