ICD-10-CM 2027
ICD-10 code for Accelerated atrioventricular conduction
From the official ICD-10-CM alphabetic index entry “Accelerated atrioventricular conduction”. Page updated September 29, 2026.
About coding Accelerated atrioventricular conduction
The ICD-10-CM code for Accelerated atrioventricular conduction is I45.6 (Pre-excitation syndrome).
Within I45 (other conduction disorders), I45.6 is specifically for Pre-excitation syndrome. Related codes cover right fascicular block (I45.0), other and unspecified right bundle-branch block (I45.1), Bifascicular block (I45.2), Trifascicular block (I45.3), nonspecific intraventricular block (I45.4), other specified heart block (I45.5), other specified conduction disorders (I45.8) and conduction disorder, unspecified (I45.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 308 (Cardiac Arrhythmia and Conduction Disorders with MCC, relative weight 1.1806), DRG 309 (Cardiac Arrhythmia and Conduction Disorders with CC, relative weight 0.7316), DRG 310 (Cardiac Arrhythmia and Conduction Disorders without CC/MCC, relative weight 0.568), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 05 (Diseases and Disorders of the Circulatory System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Accelerated atrioventricular conduction ICD-10 codes
What is the ICD-10 code for Accelerated atrioventricular conduction?
- I45.6 — Pre-excitation syndrome.
Is I45.6 billable?
- Yes. I45.6 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I45.6 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I45.6 as a principal diagnosis.
Is I45.6 a CC or MCC?
- No. I45.6 is neither a CC nor an MCC under MS-DRG v44.0.