M13.842 (Other specified arthritis, left hand) compared with M13.849 (Other specified arthritis, unspecified hand), from the official CMS tabular data. M13.842 and M13.849 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. M13.842 and M13.849 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.
| M13.842Other specified arthritis, left hand | M13.849Other specified arthritis, unspecified 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 specified arthritis, left hand is a billable ICD-10-CM diagnosis code (M13.842). | Other specified arthritis, unspecified hand is a billable ICD-10-CM diagnosis code (M13.849). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources