I49.8 Other specified cardiac arrhythmias

Billable ICD-10-CM code, FY2026.

Applicable to

• Brugada syndrome
• Coronary sinus rhythm disorder
• Ectopic rhythm disorder
• Nodal rhythm disorder

Applies from 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)

MS-DRG index

Defines the logic of DRG(s) 308-310 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 427.89 Other specified cardiac dysrhythmias (approximate)

Code annotations containing back-references to I49.8

Back-references to I49

• Code Also: M35.81 Multisystem inflammatory syndrome ("cardiac arrhythmia (I47-I49.-)")
• Type 2 Excludes: R00 Abnormalities of heart beat ("specified arrhythmias (I47-I49)")

Diagnosis Index entries for I49.8

• Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle) › sinus
• Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle) › specified NEC
• Bradyarrhythmia, cardiac
• Fibrillation › cardiac
• Fibrillation › heart
• Flutter › heart
• Incompetency, incompetent, incompetence › chronotropic › with › sinus node dysfunction
• Nodal rhythm
• Rhythm › atrioventricular nodal
• Rhythm › disorder › coronary sinus
• Rhythm › disorder › ectopic
• Rhythm › disorder › nodal
• Rhythm › nodal
• Sinus › arrhythmia
• Syndrome › Brugada
• Wandering › pacemaker (heart)

Nearby codes

• I49.3 Ventricular premature depolarization
• I49.4 Other and unspecified premature depolarization
• I49.40 Unspecified premature depolarization
• I49.49 Other premature depolarization
• I49.5 Sick sinus syndrome
• I49.8 Other specified cardiac arrhythmias (this code)
• I49.9 Cardiac arrhythmia, unspecified