I48.20 — Chronic atrial fibrillation, unspecified

I48.20

ICD-10 Chapter 9: Circulatory System — illustrative image — Chapter 9: Diseases of the circulatory system (I00–I99) — illustrative image

What this code means

Chronic atrial fibrillation is a long-standing irregular heartbeat; 'chronic' here is unspecified as to permanent status.

Also called: chronic atrial fibrillation.

When this code is used

Used for chronic atrial fibrillation, unspecified.

Where it sits in ICD-10-CM

Code I48.20 belongs to Chapter 9: Diseases of the circulatory system, which covers codes I00–I99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Palpitations

Related anatomy

Heart

Frequently asked questions

What is ICD-10-CM code I48.20?

I48.20 is the ICD-10-CM diagnosis code for “Chronic atrial fibrillation, unspecified”. Chronic atrial fibrillation is a long-standing irregular heartbeat; 'chronic' here is unspecified as to permanent status.

When is code I48.20 used?

Used for chronic atrial fibrillation, unspecified. It belongs to Chapter 9 of ICD-10-CM (Diseases of the circulatory system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.