ICD-10-CM Alphabetic Index · FY 2026 14 Entries
Arrhythmia in the ICD-10-CM Index ICD-10-CM
The main term Arrhythmia (auricle) (cardiac) (juvenile) (nodal) (reflex) (supraventricular) (transitory) (ventricle) carries 14 index entries pointing to 12 ICD-10-CM codes. The default entry is I49.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
14
Index Entries
12
Codes Referenced
I49.9
Default Code
A
Letter
14 of 14 shown
ICD-10-CM
Index Entries Under Arrhythmia 14 entries · 12 codes
Arrhythmia (auricle) (cardiac) (juvenile) (nodal) (reflex) (supraventricular) (transitory) (ventricle) I49.9
block I45.9
extrasystolic I49.49
newborn
bradycardia P29.12
occurring before birth P03.819
before onset of labor P03.810
during labor P03.811
tachycardia P29.11
psychogenic F45.8
sinus I49.8
specified NEC I49.8
vagal R55
ventricular re-entry I47.0
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
