M89.431 (Other hypertrophic osteoarthropathy, right forearm) compared with M89.439 (Other hypertrophic osteoarthropathy, unspecified forearm), from the official CMS tabular data. M89.431 and M89.439 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. M89.431 and M89.439 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.
| M89.431Other hypertrophic osteoarthropathy, right forearm | M89.439Other hypertrophic osteoarthropathy, unspecified forearm | |
|---|---|---|
| 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 hypertrophic osteoarthropathy, right forearm is a billable ICD-10-CM diagnosis code (M89.431). | Other hypertrophic osteoarthropathy, unspecified forearm is a billable ICD-10-CM diagnosis code (M89.439). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources