I49.8 – Other specified cardiac arrhythmias

ICD-10-CM 2027 diagnosis code · Other forms of heart disease

Non-billable header Expanded in 2027

ICD-10-CM code I49.8

Code: I49.8 (claims format: I498)
Description: Other specified cardiac arrhythmias
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I30-I5A Other forms of heart disease
Parent codes: I49

Billable codes under I49.8

I49.8 is a header code and cannot be used on claims. Choose the most specific code:

I49.81 – Brugada syndromeBillable · New in 2027
I49.82 – Ventricular bigeminyBillable · New in 2027
I49.89 – Other specified cardiac arrhythmias not elsewhere classifiedBillable · New in 2027

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I49 – Other cardiac arrhythmias

Excludes2 (not included here):

bradycardia NOS (R00.1)
neonatal dysrhythmia (P29.1-)
sinoatrial bradycardia (R00.1)
sinus bradycardia (R00.1)
vagal bradycardia (R00.1)

Code first:

cardiac arrhythmia complicating:
abortion or ectopic or molar pregnancy (O00-O07, O08.8)
obstetric surgery and procedures (O75.4)

Related codes in I49

I49.0 – Ventricular fibrillation and flutterHeader
I49.1 – Atrial premature depolarizationBillable
I49.2 – Junctional premature depolarizationBillable
I49.3 – Ventricular premature depolarizationBillable
I49.4 – Other and unspecified premature depolarizationHeader
I49.5 – Sick sinus syndromeBillable
I49.9 – Cardiac arrhythmia, unspecifiedBillable

Frequently asked questions

What is ICD-10 code I49.8?

I49.8 is the ICD-10-CM code for other specified cardiac arrhythmias, in the block I30-I5A (Other forms of heart disease).

Is I49.8 a billable code?

No. I49.8 is a header code with more specific child codes; report one of the billable codes listed above.

What category does I49.8 belong to?

It belongs to category I49 – Other cardiac arrhythmias.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.