I39 vs M05.31
I39 (Endocarditis and heart valve disorders in diseases classified elsewhere) compared with M05.31 (Rheumatoid heart disease with rheumatoid arthritis of shoulder), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. I39 carries an Excludes1 note covering M05.31: “rheumatoid arthritis (M05.31)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| I39Endocarditis and heart valve disorders in diseases classified elsewhere | M05.31Rheumatoid heart disease with rheumatoid arthritis of shoulder | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Endocarditis and heart valve disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (I39). | Rheumatoid heart disease with rheumatoid arthritis of shoulder is a non-billable ICD-10-CM category code (M05.31). |
| Code first | underlying disease, such as: Q fever (A78) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources