ICD-10 Code I49 – Other cardiac arrhythmias (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I49 – Other cardiac arrhythmias
What it is
I49 identifies cardiac rhythm disturbances that do not fit a more specific arrhythmia code. Use it for documented “other” arrhythmias when the record does not name a more precise type.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include an irregular pulse, palpitations, dizziness, or ECG evidence of abnormal rhythm.
When to use this code
Use I49 when the provider documents an arrhythmia and does not specify a more exact category, or when the condition is described as “other cardiac arrhythmia.” Check the note for the exact rhythm diagnosis before assigning this code. If the chart names a specific arrhythmia, code that condition instead.
Do not use for
Do not use I49 for atrial fibrillation, atrial flutter, ventricular fibrillation, or other specifically named arrhythmias. Do not use it when documentation supports a more precise ICD-10 code.
Coding tip
Review the ECG report and provider assessment together; if the rhythm is named, code the specific arrhythmia rather than the unspecified grouping.