M00.861 (Arthritis due to other bacteria, right knee) compared with M00.862 (Arthritis due to other bacteria, left knee), from the official CMS tabular data. M00.861 and M00.862 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. M00.861 and M00.862 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.
| M00.861Arthritis due to other bacteria, right knee | M00.862Arthritis due to other bacteria, left 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 | Arthritis due to other bacteria, right knee is a billable ICD-10-CM diagnosis code (M00.861). | Arthritis due to other bacteria, left knee is a billable ICD-10-CM diagnosis code (M00.862). |
| Use additional code | code (B96) to identify bacteria | code (B96) to identify bacteria |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources