ICD-10 Code I49.8 – Other specified cardiac arrhythmias (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I49.8 – Other specified cardiac arrhythmias
What it is
I49.8 is used for cardiac rhythm disturbances that do not fit a more specific arrhythmia code. It captures other documented abnormal heart rhythms when the record names the condition clearly.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include an irregular pulse, palpitations, dizziness, or rhythm abnormalities noted on ECG or monitoring.
When to use this code
Use I49.8 when the provider documents a specific arrhythmia that is not classified elsewhere in the ICD-10-CM arrhythmia categories. It is appropriate when the chart supports a distinct rhythm disorder but no more precise code applies. Check documentation if the rhythm is described only generally.
Do not use for
Do not use this code for atrial fibrillation, flutter, ventricular arrhythmias, or cardiac arrest when a more specific code is available. Avoid it for nonspecific symptoms without a documented arrhythmia diagnosis.
Coding tip
Code the documented rhythm diagnosis exactly as stated and confirm whether a more specific arrhythmia code exists before assigning I49.8.