I30.9 vs I31.3
I30.9 (Acute pericarditis, unspecified) compared with I31.3 (Pericardial effusion (noninflammatory)), 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. I31.3 carries an Excludes1 note covering I30.9: “acute pericardial effusion (I30.9)”
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
| I30.9Acute pericarditis, unspecified | I31.3Pericardial effusion (noninflammatory) | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | I00-I99 — Diseases of the Circulatory System (I00-I99) |
| Definition | Acute pericarditis, unspecified is a billable ICD-10-CM diagnosis code (I30.9). | Pericardial effusion (noninflammatory) is a non-billable ICD-10-CM category code (I31.3). |
| Includes | acute mediastinopericarditis acute myopericarditis acute pericardial effusion acute pleuropericarditis | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources