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I49.9

✓ Billable

Cardiac arrhythmia, unspecified

Diseases of the circulatory system (I00-I99)

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Also Known As

Arrhythmia (cardiac) NOS

⚠️ Excludes2

inherited from I49

Rules from parent category I49: Other cardiac arrhythmias

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

📋 Code Instructions

from I49
  • • Code first: cardiac arrhythmia complicating:
  • • Code first: abortion or ectopic or molar pregnancy (O00-O07, O08.8)
  • • Code first: obstetric surgery and procedures (O75.4)

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Code Information

CodeI49.9
BillableYes
ParentI49
CategoryDiseases of the circulatory system (I00-I99)
Excludes10 rule(s)
Excludes25 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)