R94.31 — Abnormal electrocardiogram [ECG] [EKG]

R94.31

ICD-10 Chapter 18: Symptoms, Signs & Abnormal Findings — illustrative image — Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99) — illustrative image

What this code means

An abnormal electrocardiogram (ECG/EKG) is a heart tracing finding outside the expected pattern, needing clinical interpretation.

Also called: abnormal ecg, abnormal ekg.

When this code is used

Used for abnormal electrocardiogram (ECG) (EKG).

Where it sits in ICD-10-CM

Code R94.31 belongs to Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, which covers codes R00–R99 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 R94.31?

R94.31 is the ICD-10-CM diagnosis code for “Abnormal electrocardiogram [ECG] [EKG]”. An abnormal electrocardiogram (ECG/EKG) is a heart tracing finding outside the expected pattern, needing clinical interpretation.

When is code R94.31 used?

Used for abnormal electrocardiogram (ECG) (EKG). It belongs to Chapter 18 of ICD-10-CM (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified).

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.