ICD-10-CM Current in FY 2027

I49.9

Cardiac arrhythmia, unspecified

Release: FY 2027
Effective: October 1, 2026

Official source

Hierarchy

Where I49.9 sits in the official hierarchy. Each level is the code it is classified under.

I49 Parent Other cardiac arrhythmias
I49.9 This code Cardiac arrhythmia, unspecified

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

Inclusion Terms

Arrhythmia (cardiac) NOS

Excludes2

bradycardia NOS ( R00.1 )

Inherited from I49 — Other cardiac arrhythmias

Excludes2

neonatal dysrhythmia ( P29.1- )

Inherited from I49 — Other cardiac arrhythmias

Excludes2

sinoatrial bradycardia ( R00.1 )

Inherited from I49 — Other cardiac arrhythmias

Excludes2

sinus bradycardia ( R00.1 )

Inherited from I49 — Other cardiac arrhythmias

Excludes2

vagal bradycardia ( R00.1 )

Inherited from I49 — Other cardiac arrhythmias

Code First

cardiac arrhythmia complicating:

Inherited from I49 — Other cardiac arrhythmias

Code First

abortion or ectopic or molar pregnancy (O00-O07, O08.8 )

Inherited from I49 — Other cardiac arrhythmias

Code First

obstetric surgery and procedures ( O75.4 )

Inherited from I49 — Other cardiac arrhythmias

Version History

How I49.9 appears in each release imported from the official files, newest first.

FY 2027 Effective October 1, 2026
Current

Cardiac arrhythmia, unspecified
FY 2026 Effective October 1, 2025
Unchanged

Cardiac arrhythmia, unspecified

Other codes under I49

Data Source

Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.

Release: FY 2027
Effective: October 1, 2026
Source file: icd10cm-code-descriptions-2027.zip

Official ICD-10-CM source files (opens in a new tab)

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