I44.0 Atrioventricular block, first degree

Billable ICD-10-CM code, FY2026.

MS-DRG index

Defines the logic of DRG(s) 308-310 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 426.11 First degree atrioventricular block

Diagnosis Index entries for I44.0

• Block, blocked › atrioventricular (incomplete) (partial) › first degree
• Block, blocked › heart › first degree (atrioventricular)
• Prolonged, prolongation (of) › interval

Nearby codes

• I44 Atrioventricular and left bundle-branch block
• I44.0 Atrioventricular block, first degree (this code)
• I44.1 Atrioventricular block, second degree
• I44.2 Atrioventricular block, complete
• I44.3 Other and unspecified atrioventricular block
• I44.30 Unspecified atrioventricular block
• I44.39 Other atrioventricular block