I44.1 Atrioventricular block, second degree

Billable ICD-10-CM code, FY2026.

Applicable to

• Atrioventricular block, type I and II
• Möbitz block, type I and II
• Second degree block, type I and II
• Wenckebach's block

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 426.12 Mobitz (type) II atrioventricular block (approximate)
• 426.13 Other second degree atrioventricular block (approximate)

Diagnosis Index entries for I44.1

• Block, blocked › atrioventricular (incomplete) (partial) › second degree (types I and II)
• Block, blocked › atrioventricular (incomplete) (partial) › types I and II
• Block, blocked › heart › second degree (atrioventricular)
• Block, blocked › Mobitz (types I and II)
• Block, blocked › second degree (types I and II)
• Block, blocked › Wenckebach (types I and II)
• Mobitz heart block (atrioventricular)
• Phenomenon › Wenckebach's
• Wenckebach's block or phenomenon

Nearby codes

• I44 Atrioventricular and left bundle-branch block
• I44.0 Atrioventricular block, first degree
• I44.1 Atrioventricular block, second degree (this code)
• I44.2 Atrioventricular block, complete
• I44.3 Other and unspecified atrioventricular block
• I44.30 Unspecified atrioventricular block
• I44.39 Other atrioventricular block
• I44.4 Left anterior fascicular block