I44.7 — Left bundle-branch block, unspecified

I44.7

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

What this code means

Left bundle-branch block is a delay or block in the electrical pathway of the heart's left side, seen on an ECG.

Also called: left bundle branch block, lbbb.

When this code is used

Used for left bundle-branch block, unspecified.

Where it sits in ICD-10-CM

Code I44.7 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 anatomy

Heart

Frequently asked questions

What is ICD-10-CM code I44.7?

I44.7 is the ICD-10-CM diagnosis code for “Left bundle-branch block, unspecified”. Left bundle-branch block is a delay or block in the electrical pathway of the heart's left side, seen on an ECG.

When is code I44.7 used?

Used for left bundle-branch block, 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.