I31 vs S26
I31 (Other diseases of pericardium) compared with S26 (Injury of heart), 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. I31 carries an Excludes1 note covering S26: “traumatic injury to pericardium (S26.-)”
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
| I31Other diseases of pericardium | S26Injury of heart | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header Report instead: S26.00XA, S26.00XD, S26.00XS, S26.01XA, S26.01XD |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Other diseases of pericardium is a non-billable ICD-10-CM category code (I31). | Injury of heart is a non-billable ICD-10-CM category code (S26). |
| 7th character | — | The appropriate 7th character is to be added to each code from category S26 |
| Includes | — | injuries of breast injuries of chest (wall) injuries of interscapular area |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources