M05.321 (Rheumatoid heart disease with rheumatoid arthritis of right elbow) compared with M05.329 (Rheumatoid heart disease with rheumatoid arthritis of unspecified elbow), from the official CMS tabular data. M05.321 and M05.329 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. M05.321 and M05.329 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.
| M05.321Rheumatoid heart disease with rheumatoid arthritis of right elbow | M05.329Rheumatoid heart disease with rheumatoid arthritis of unspecified elbow | |
|---|---|---|
| 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 heart disease with rheumatoid arthritis of right elbow is a billable ICD-10-CM diagnosis code (M05.321). | Rheumatoid heart disease with rheumatoid arthritis of unspecified elbow is a billable ICD-10-CM diagnosis code (M05.329). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources