M23.8X2 (Other internal derangements of left knee) compared with M23.8X9 (Other internal derangements of unspecified knee), from the official CMS tabular data. M23.8X2 and M23.8X9 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. M23.8X2 and M23.8X9 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.
| M23.8X2Other internal derangements of left knee | M23.8X9Other internal derangements of unspecified knee | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Other internal derangements of left knee is a billable ICD-10-CM diagnosis code (M23.8X2). | Other internal derangements of unspecified knee is a billable ICD-10-CM diagnosis code (M23.8X9). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources