M20.022 (Boutonnière deformity of left finger(s)) compared with M20.029 (Boutonnière deformity of unspecified finger(s)), from the official CMS tabular data. M20.022 and M20.029 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. M20.022 and M20.029 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.
| M20.022Boutonnière deformity of left finger(s) | M20.029Boutonnière deformity of unspecified finger(s) | |
|---|---|---|
| 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 | Boutonnière deformity of left finger(s) is a billable ICD-10-CM diagnosis code (M20.022). | Boutonnière deformity of unspecified finger(s) is a billable ICD-10-CM diagnosis code (M20.029). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources