ICD-10 Code I47.9 – Paroxysmal tachycardia, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I47.9 – Paroxysmal tachycardia, unspecified
What it is
I47.9 identifies a sudden, episodic fast heart rhythm when the specific type is not documented. Use it when the record confirms paroxysmal tachycardia but does not name the exact arrhythmia.
Clinical signs
Clinical features vary; refer to documentation. Typical notes may describe abrupt onset and termination of rapid palpitations, with possible dizziness, chest discomfort, or shortness of breath during episodes.
When to use this code
Use this code when the provider documents paroxysmal tachycardia without further detail, such as SVT, atrial tachycardia, or another named rhythm. It also fits encounter notes that mention a recurrent tachycardia episode but do not specify the mechanism. If the type is identified elsewhere in the chart, code the more specific diagnosis instead.
Do not use for
Do not use I47.9 when the record clearly identifies a more specific tachyarrhythmia or when the rhythm is sinus tachycardia. Check documentation if the episode is better described by another arrhythmia code.
Coding tip
Before assigning I47.9, look for ECG interpretation or cardiology notes that name the rhythm; if the type is stated, code it specifically.