M05.641 (Rheumatoid arthritis of right hand with involvement of other organs and systems) compared with M05.642 (Rheumatoid arthritis of left hand with involvement of other organs and systems), from the official CMS tabular data. M05.641 and M05.642 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. M05.641 and M05.642 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.
| M05.641Rheumatoid arthritis of right hand with involvement of other organs and systems | M05.642Rheumatoid arthritis of left hand with involvement of other organs and systems | |
|---|---|---|
| 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 | Rheumatoid arthritis of right hand with involvement of other organs and systems is a billable ICD-10-CM diagnosis code (M05.641). | Rheumatoid arthritis of left hand with involvement of other organs and systems is a billable ICD-10-CM diagnosis code (M05.642). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources