I49.5
ICD-10BillableSick sinus syndrome
Official ICD-10-CM descriptor (FY2026)
Sick sinus syndrome
I49.5 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Tachycardia-bradycardia syndrome
Related codes in I49
- I49.0Ventricular fibrillation and fluttercategory
- I49.1Atrial premature depolarization
- I49.2Junctional premature depolarization
- I49.3Ventricular premature depolarization
- I49.4Other and unspecified premature depolarizationcategory
- I49.8Other specified cardiac arrhythmias
- I49.9Cardiac arrhythmia, unspecified
Where this code sits
- Parent code
- I49
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.