ICD-10 Code I30 – Acute pericarditis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I30 – Acute pericarditis
What it is
I30 identifies acute inflammation of the pericardium, the sac surrounding the heart. Use it when the record documents a new or sudden pericardial inflammatory process.
Clinical signs
Typical findings include sharp chest pain, a pericardial friction rub, and electrocardiographic changes consistent with pericarditis. Clinical features vary; refer to documentation.
When to use this code
Use I30 when the clinician diagnoses acute pericarditis and the note supports an active, current episode. It may also apply when imaging, exam, or specialist assessment confirms pericardial inflammation. If the record does not clearly state acute pericarditis, check documentation before coding.
Do not use for
Do not use this code for chronic pericarditis, pericardial effusion without inflammation, or nonspecific chest pain. Check documentation if the diagnosis is uncertain or another pericardial disorder is named.
Coding tip
Verify whether the provider documented an acute episode and whether a more specific I30 subcode is available.