Alphabetic Index FY2027

I49

Other cardiac arrhythmias

FY2027Chapter 9: Diseases of the circulatory system/I30–I5A Other forms of heart disease

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

I49 is a non-billable ICD-10-CM code category for other cardiac arrhythmias. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are I49.0 Ventricular fibrillation and flutter, I49.1 Atrial premature depolarization, I49.2 Junctional premature depolarization, I49.3 Ventricular premature depolarization and 4 more. Its coding notes include a Code first instruction and 15 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

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

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code
  • bradycardia NOS (R00.1)
  • neonatal dysrhythmia (P29.1-)
  • sinoatrial bradycardia (R00.1)
  • sinus bradycardia (R00.1)
  • vagal bradycardia (R00.1)
Also from chapter/block level (10 notes)
Inherited from Chapter 9 Diseases of the circulatory system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

More specific codes under I49 8