M66.131 (Rupture of synovium, right wrist) compared with M66.139 (Rupture of synovium, unspecified wrist), from the official CMS tabular data. M66.131 and M66.139 code the same condition on opposite sides. MedCoder-derived
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. M66.131 and M66.139 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.
| M66.131Rupture of synovium, right wrist | M66.139Rupture of synovium, unspecified wrist | |
|---|---|---|
| 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 | Rupture of synovium, right wrist is a billable ICD-10-CM diagnosis code (M66.131). | Rupture of synovium, unspecified wrist is a billable ICD-10-CM diagnosis code (M66.139). |
| Includes | rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength | rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources