ICD-10 Code I49.40 – Unspecified premature depolarization (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I49.40 – Unspecified premature depolarization
What it is
I49.40 identifies a premature depolarization when the provider documents an ectopic beat but does not specify whether it is atrial, junctional, or ventricular. Use this code when the type is unclear or not stated.
Clinical signs
Patients may report palpitations, skipped beats, or brief fluttering sensations. On ECG, an early beat may be seen, but the exact origin is not documented; clinical features vary, refer to documentation.
When to use this code
Use I49.40 when the record says premature depolarization, premature beats, or ectopy without further classification. It also fits when the note confirms an arrhythmia but does not identify the chamber or focus. If the provider later specifies atrial, junctional, or ventricular origin, code that specific type instead.
Do not use for
Do not use this code when the documentation clearly identifies premature atrial, junctional, or ventricular depolarization. Also avoid it if the rhythm disturbance is better described by another arrhythmia diagnosis. Check documentation.
Coding tip
Review the ECG interpretation and the provider’s final assessment before assigning I49.40.