ICD-10 Code I31.8 – Other specified diseases of pericardium (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I31.8 – Other specified diseases of pericardium
What it is
I31.8 identifies a pericardial disorder that does not fit a more specific ICD-10 category. Use it when the record names another specified disease of the pericardium and no better code is available.
Clinical signs
Clinical features vary; refer to documentation. Findings may include chest discomfort, pericardial friction rub, or imaging evidence of pericardial abnormality, depending on the underlying condition.
When to use this code
Use I31.8 when the clinician documents a specific pericardial disease that is not indexed elsewhere in ICD-10-CM. It may apply when the diagnosis is clearly stated but the exact named pericardial condition is not separately listed. Check documentation if the record only says “pericardial disease” without detail.
Do not use for
Do not use this code for acute pericarditis, pericardial effusion, or other more specific pericardial diagnoses that have their own codes. If the chart is vague or incomplete, check documentation before assigning I31.8.
Coding tip
Assign I31.8 only after confirming the provider’s exact pericardial diagnosis and ruling out a more specific code.