M17.30 (Unilateral post-traumatic osteoarthritis, unspecified knee) compared with M17.31 (Unilateral post-traumatic osteoarthritis, right knee), from the official CMS tabular data. M17.30 and M17.31 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. M17.30 and M17.31 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.
| M17.30Unilateral post-traumatic osteoarthritis, unspecified knee | M17.31Unilateral post-traumatic osteoarthritis, right 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 | Unilateral post-traumatic osteoarthritis, unspecified knee is a billable ICD-10-CM diagnosis code (M17.30). | Unilateral post-traumatic osteoarthritis, right knee is a billable ICD-10-CM diagnosis code (M17.31). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources