S83.401D (Sprain of unspecified collateral ligament of right knee, subsequent encounter) compared with S83.409D (Sprain of unspecified collateral ligament of unspecified knee, subsequent encounter), from the official CMS tabular data. S83.401D and S83.409D 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. S83.401D and S83.409D 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.
| S83.401DSprain of unspecified collateral ligament of right knee, subsequent encounter | S83.409DSprain of unspecified collateral ligament of unspecified knee, 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 | Sprain of unspecified collateral ligament of right knee, subsequent encounter is a billable ICD-10-CM diagnosis code (S83.401D). | Sprain of unspecified collateral ligament of unspecified knee, subsequent encounter is a billable ICD-10-CM diagnosis code (S83.409D). |
| 7th character | The appropriate 7th character is to be added to each code from category S83 | The appropriate 7th character is to be added to each code from category S83 |
| Includes | avulsion of joint or ligament of knee laceration of cartilage, joint or ligament of knee sprain of cartilage, joint or ligament of knee traumatic hemarthrosis of joint or ligament of knee | avulsion of joint or ligament of knee laceration of cartilage, joint or ligament of knee sprain of cartilage, joint or ligament of knee traumatic hemarthrosis of joint or ligament of knee |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources