M18.50 (Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand) compared with M18.52 (Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand), from the official CMS tabular data. M18.50 and M18.52 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. M18.50 and M18.52 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.
| M18.50Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand | M18.52Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand | |
|---|---|---|
| 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 unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand is a billable ICD-10-CM diagnosis code (M18.50). | Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand is a billable ICD-10-CM diagnosis code (M18.52). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources