ICD-10 Code I31 – Other diseases of pericardium (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I31 – Other diseases of pericardium
What it is
I31 covers pericardial disorders that do not fit a more specific diagnosis. It refers to conditions affecting the pericardium, the sac around the heart, when documentation is nonspecific or grouped under “other diseases.”
Clinical signs
Clinical features vary; refer to documentation. Findings may include pericardial symptoms or imaging evidence of pericardial abnormality, but the record should support a pericardial disease rather than a myocardial or pleural condition.
When to use this code
Use I31 when the provider documents an unspecified or other pericardial disorder and no more specific ICD-10-CM code applies. It is appropriate when the note identifies a pericardial condition but does not name a distinct entity such as acute pericarditis or effusion. Check documentation for the exact diagnosis and any linked cause.
Do not use for
Do not use I31 for acute pericarditis, pericardial effusion, or other separately coded pericardial diagnoses when the record is specific. Also avoid it if the abnormality is not truly pericardial. Check documentation.
Coding tip
Choose the most specific pericardial code available; use I31 only when the record supports “other” or nonspecific pericardial disease.