DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I44 Atrioventricular and left bundle-branch block

  • Header · not billable

I44 is not billable. The category heads 10 billable codes in FY2027, grouped under 8 subdivisions.

Index → code

  • Lenegre's disease → I44.2
  • Rytand-Lipsitch syndrome → I44.2
  • Wenckebach's block or phenomenon → I44.1

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I30-I5A Other forms of heart disease (I30-I5A)
  3. I44 Atrioventricular and left bundle-branch block
Billable codes
10
Subdivisions
8
CC / MCC codes
1 / 0
HCC V28 codes
1
New FY2027
0
Index entries
41

Codes in I44

  1. I44.0
    Atrioventricular block, first degree
    Billable
  2. I44.1
    Atrioventricular block, second degree
    Billable
    Inclusion terms 4

    Inclusion terms

    • Atrioventricular block, type I and II
    • Möbitz block, type I and II
    • Second degree block, type I and II
    • Wenckebach's block
  3. I44.2
    Atrioventricular block, complete
    BillableCC238
    Inclusion terms 2

    Inclusion terms

    • Complete heart block NOS
    • Third degree block
  4. I44.3
    Other and unspecified atrioventricular block
    Header
    Inclusion terms 1

    Inclusion terms

    • Atrioventricular block NOS
  5. I44.30
    Unspecified atrioventricular block
    Billable
  6. I44.39
    Other atrioventricular block
    Billable
  7. I44.4
    Left anterior fascicular block
    Billable
  8. I44.5
    Left posterior fascicular block
    Billable
  9. I44.6
    Other and unspecified fascicular block
    Header
  10. I44.60
    Unspecified fascicular block
    Billable
    Inclusion terms 1

    Inclusion terms

    • Left bundle-branch hemiblock NOS
  11. I44.69
    Other fascicular block
    Billable
  12. I44.7
    Left bundle-branch block, unspecified
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

Notes that also apply

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Mobitz heart block (atrioventricular) → I44.1
  • Wenckebach's block or phenomenon → I44.1
  • Lenegre's disease → I44.2
  • Lev's disease or syndrome (acquired complete heart block) → I44.2
  • Rytand-Lipsitch syndrome → I44.2
  • Prolonged, prolongation (of)interval → I44.0
  • Block, blockedMobitz (types I and II) → I44.1
  • Block, blockedsecond degree (types I and II) → I44.1
  • Block, blockedWenckebach (types I and II) → I44.1
  • PhenomenonWenckebach's → I44.1
  • Block, blockedthird degree → I44.2
  • Disease, diseasedLenegre's → I44.2
  • Disease, diseasedLev's (acquired complete heart block) → I44.2
  • Rhythmidioventricular → I44.2
  • SyndromeLev's → I44.2
  • SyndromeRytand-Lipsitch → I44.2
  • Block, blockedatrioventricular (incomplete) (partial) → I44.30
  • Interruptionbundle of His → I44.30
  • Sclerosis, scleroticbundle of His → I44.39
  • Block, blockedfascicular (left) → I44.60
  • Block, blockedatrioventricular (incomplete) (partial)first degree → I44.0
  • Block, blockedheartfirst degree (atrioventricular) → I44.0
  • Block, blockedatrioventricular (incomplete) (partial)second degree (types I and II) → I44.1
  • Block, blockedatrioventricular (incomplete) (partial)types I and II → I44.1
  • Block, blockedheartsecond degree (atrioventricular) → I44.1
  • Block, blockedatrioventricular (incomplete) (partial)with atrioventricular dissociation → I44.2
  • Block, blockedatrioventricular (incomplete) (partial)complete → I44.2
  • Block, blockedatrioventricular (incomplete) (partial)third degree → I44.2
  • Block, blockedconductioncomplete → I44.2
  • Block, blockedheartcomplete (atrioventricular) → I44.2
  • Block, blockedheartthird degree (atrioventricular) → I44.2
  • Dissociationauriculoventricular or atrioventricular (AV) (any degree) (isorhythmic)with heart block → I44.2
  • Block, blockedatrioventricular (incomplete) (partial)specified NEC → I44.39
  • Block, blockedfascicular (left)anterior → I44.4
  • Block, blockedfascicular (left)posterior → I44.5
  • Block, blockedfascicular (left)specified NEC → I44.69
  • Block, blockedbundle-branch (complete) (false) (incomplete)left → I44.7
  • Block, blockedbundle-branch (complete) (false) (incomplete)lefthemiblock → I44.60
  • Block, blockedbundle-branch (complete) (false) (incomplete)leftincomplete → I44.7
  • Block, blockedbundle-branch (complete) (false) (incomplete)lefthemiblockanterior → I44.4

1 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy