ICD-10-CM 2027
ICD-10 code for atrioventricular block
From the official ICD-10-CM alphabetic index entry “Block, blocked › atrioventricular (incomplete) (partial)”. Page updated September 29, 2026.
About coding atrioventricular block
The ICD-10-CM code for atrioventricular block is I44.30 (Unspecified atrioventricular block). The official index lists 9 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I44.30.
Within I44.3, choose I44.30 (Unspecified atrioventricular block) only when documentation doesn't support a more specific option: other atrioventricular block (I44.39).
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) and DRG 310 (Cardiac Arrhythmia and Conduction Disorders without CC/MCC, relative weight 0.568), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific atrioventricular block codes (official index)
- with atrioventricular dissociation I44.2 — Atrioventricular block, complete
- complete I44.2 — Atrioventricular block, complete
- congenital Q24.6 — Congenital heart block
- congenital Q24.6 — Congenital heart block
- first degree I44.0 — Atrioventricular block, first degree
- second degree (types I and II) I44.1 — Atrioventricular block, second degree
- specified NEC I44.39 — Other atrioventricular block
- third degree I44.2 — Atrioventricular block, complete
- types I and II I44.1 — Atrioventricular block, second degree
Common questions about atrioventricular block ICD-10 codes
What is the ICD-10 code for atrioventricular block?
- I44.30 — Unspecified atrioventricular block. More specific codes apply when the documentation supports them: I44.2, I44.2, Q24.6, Q24.6 and others below.
What is the ICD-10 code for complete atrioventricular block?
- I44.2 — Atrioventricular block, complete.
What is the ICD-10 code for congenital atrioventricular block?
- Q24.6 — Congenital heart block.
What is the ICD-10 code for first degree atrioventricular block?
- I44.0 — Atrioventricular block, first degree.
What is the ICD-10 code for second degree atrioventricular block?
- I44.1 — Atrioventricular block, second degree.
What is the ICD-10 code for third degree atrioventricular block?
- I44.2 — Atrioventricular block, complete.
What is the ICD-10 code for types i and ii atrioventricular block?
- I44.1 — Atrioventricular block, second degree.
Is I44.30 billable?
- Yes. I44.30 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I44.30 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I44.30 as a principal diagnosis.
Is I44.30 a CC or MCC?
- No. I44.30 is neither a CC nor an MCC under MS-DRG v44.0.